1: a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe [syn: {hydrogen}, {atomi...

1: a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium [syn: {hydrogen bomb}, {fusion bomb}, {thermonuclear bomb}]

1: shaped in the form of the letter H

1: prolific English writer best known for his science-fiction novels; he also wrote on contemporary social problems and wrote popular accounts of history and science (1866-1946) [syn: {Wells}, {Herber...

1: British writer of short stories (1870-1916) [syn: {Munro}, {Hector Hugh Munro}, {Saki}]

1: a British psychologist (born in Germany) noted for his theories of intelligence and personality and for his strong criticism of Freudian psychoanalysis [syn: {Eysenck}, {Hans Eysenck}, {Hans Jurgen...

1: United States journalist and literary critic (1880-1956) [syn: {Mencken}, {Henry Louis Mencken}]

1: the type species of genus Heliobacter; produces urease and is associated with several gastroduodenal diseases (including gastritis and gastric ulcers and duodenal ulcers and other peptic ulcers) [s...

1: a ship of the British navy; in 1789 part of the crew mutineed against their commander William Bligh and set him afloat in an open boat [syn: {Bounty}]

1: a unit of power equal to 746 watts [syn: {horsepower}, {HP}]

1: binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a ...

1: (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time o...

1: the amount that can be bought for a halfpenny [syn: {halfpennyworth}]

1: an English coin worth half a penny [syn: {halfpenny}]

1: a loud laugh that sounds like a horse neighing [syn: {hee-haw}, {horselaugh}, {haw-haw}] 2: a ditch with one side being a retaining wall; used to divide lands without defacing the landscape [syn: {...

1: a combination of protease inhibitors taken with reverse transcriptase inhibitors; used in treating AIDS and HIV [syn: {drug cocktail}, {highly active antiretroviral therapy}]

1: genus of New Zealand mat-forming herbs or subshrubs: vegetable sheep [syn: {genus Haastia}]

1: cushion-forming New Zealand herb having leaves densely covered with tawny hairs [syn: {vegetable sheep}, {sheep plant}]

1: an Old Testament book tellin Habakkuk's prophecies [syn: {Habakkuk}, {Book of Habakkuk}]

1: a Hebrew minor prophet 2: an Old Testament book tellin Habakkuk's prophecies [syn: {Habacuc}, {Book of Habakkuk}]

1: music composed in duple time for dancing the habanera 2: a Cuban dance in duple time

1: a writ ordering a prisoner to be brought before a judge [syn: {writ of habeas corpus}] 2: the civil right to obtain a writ of habeas corpus as protection against illegal imprisonment

1: chiefly terrestrial orchids with tubers or fleshy roots often having long slender spurs and petals and lip lobes; includes species formerly placed in genus Gymnadeniopsis [syn: {genus Habenaria}]

1: bog orchid of eastern North America with a spike of pure white fringed flowers [syn: {white fringed orchis}, {white fringed orchid}]

1: south European orchid having fragrant greenish-white flowers; sometimes placed in genus Habenaria [syn: {lesser butterfly orchid}, {Platanthera bifolia}]

1: south European orchid with dark green flowers that are larger and less fragrant than Platanthera bifolia; sometimes placed in genus Habenaria [syn: {greater butterfly orchid}, {Platanthera chlorant...

1: orchid with spikes of many fragrant white flowers on erect leafy stems; of wet or boggy ground through most of the West and northern North America [syn: {bog rein orchid}, {bog candles}]

1: slender inland rein orchid similar to coastal rein orchid but with pale greenish-yellow flowers [syn: {elegant Habenaria}]

1: North American orchid similar to Habenaria psycodes with larger paler flowers [syn: {purple-fringed orchid}, {purple-fringed orchis}]

1: stout orchid of central California to northern Washington having racemes of white fragrant bilaterally symmetrical flowers [syn: {coastal rein orchid}]

1: a long-spurred orchid with base leaves and petals converging under the upper sepal [syn: {Hooker's orchid}]

1: fringed orchid of the eastern United States having a greenish flower with the lip deeply lacerate [syn: {ragged orchid}, {ragged orchis}, {ragged-fringed orchid}, {green fringed orchis}]

1: orchid of boggy or wet lands of north central United States having racemes of very fragrant creamy or greenish white flowers [syn: {prairie orchid}, {prairie white-fringed orchis}]

1: slender fringed orchid of eastern North America having white flowers [syn: {snowy orchid}]

1: orchid having a raceme of large greenish-white flowers on a single flower stalk growing between two elliptic or round basal leaves lying on the ground; from northern Oregon and Montana across Canad...

1: orchid of northeastern and alpine eastern North America closely related to the purple fringed orchids but having rosy-purple or violet flowers with denticulate leaf divisions [syn: {purple fringele...

1: North American orchid with clusters of fragrant purple fringed flowers [syn: {purple-fringed orchid}, {purple-fringed orchis}]

1: similar to coastal rein orchid but with smaller flowers; Alaska to Baja California and east to the Dakotas and Colorado [syn: {Alaska rein orchid}]

1: German chemist noted for the synthetic production of ammonia from the nitrogen in air (1868-1934) [syn: {Fritz Haber}]

1: an industrial process for producing ammonia from nitrogen and hydrogen by combining them under high pressure in the present of an iron catalyst [syn: {Haber-Bosch process}]

1: an industrial process for producing ammonia from nitrogen and hydrogen by combining them under high pressure in the present of an iron catalyst [syn: {Haber process}]

1: a merchant who sells men's clothing [syn: {clothier}]

1: a store where men's clothes are sold [syn: {clothing store}, {haberdashery store}, {mens store}] 2: the drygoods sold by a haberdasher [syn: {men's furnishings}]

1: a store where men's clothes are sold [syn: {clothing store}, {haberdashery}, {mens store}]

1: (Middle Ages) a light sleeveless coat of chain mail worn under the hauberk

1: dressed or clothed especially in fine attire; often used in combination; "the elegantly attired gentleman"; "neatly dressed workers"; "monks garbed in hooded robes"; "went about oddly garmented"; "...

1: qualify for teaching at a university in Europe; "He habilitated after his sabbatical at a prestigious American university" 2: provide with clothes or put clothes on; "Parents must feed and dress th...

1: an established custom; "it was their habit to dine at 7 every evening" [syn: {wont}] 2: a pattern of behavior acquired through frequent repetition; "she had a habit twirling the ends of her hair"; ...

1: causing or characterized by addiction; "addictive drugs"; "addictive behavior" [syn: {addictive}] [ant: {nonaddictive}]

1: fit for habitation; "the habitable world" [syn: {inhabitable}]

1: the type of environment in which an organism or group normally lives or occurs; "a marine habitat"; "he felt safe on his home grounds" [syn: {home ground}]

1: the native habitat or home of an animal or plant 2: housing that someone is living in; "he built a modest dwelling near the pond"; "they raise money to provide homes for the homeless" [syn: {dwelli...

1: dressed in a habit; "the habited men of the monastery"

1: made a norm or custom or habit; "his habitual practice was to eat an early supper"; "her habitual neatness" 2: commonly used or practiced; usual; "his accustomed thoroughness"; "took his customary ...

1: repeated spontaneous abortion (often for no known reason)

1: someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior) [syn: {recidivist}, {repeater}]

1: according to routine or established practice; "he routinely parked in a no-parking zone" [syn: {routinely}] 2: according to habit or custom; "her habitually severe expression"; "he habitually keeps...

1: take or consume (regularly or habitually); "She uses drugs rarely" [syn: {use}] 2: make psychologically or physically used (to something); "She became habituated to the background music" [syn: {acc...

1: being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs) [syn: {addiction}, {dependence}, {dependency}] 2: ...

1: habitual mode of behavior

1: a regular patron; "an habitue of the racetrack"; "a bum who is a Central Park fixture" [syn: {regular}, {fixture}]

1: person's predisposition to be affected by something (as a disease); "the consumptive habitus" 2: constitution of the human body [syn: {physique}, {build}, {body-build}]

1: English illustrator of several of Dickens' novels (1815-1882) [syn: {Browne}, {Phiz}]

1: a royal German family that provided rulers for several European states and wore the crown of the Holy Roman Empire from 1440 to 1806 [syn: {Hapsburg}]

1: a diacritical mark (an inverted circumflex) placed above certain letters (such as c) to indicate pronunciation [syn: {wedge}]

1: a Shinto god of war

1: shading consisting of multiple crossing lines [syn: {hatch}, {hatching}, {crosshatch}]

1: a large estate in Spanish-speaking countries 2: the main house on a ranch or large estate

1: one who works hard at boring tasks [syn: {drudge}, {hacker}] 2: a politician who belongs to a small clique that controls a political party for private rather than public ends [syn: {machine politic...

1: someone who drives a taxi for a living [syn: {taxidriver}, {taximan}, {cabdriver}, {cabman}, {cabby}, {hack-driver}, {livery driver}]

1: fix a computer program piecemeal until it works; "I'm not very good at hacking but I'll give it my best" [syn: {hack}]

1: a mediocre and disdained writer [syn: {hack}, {literary hack}]

1: someone who drives a taxi for a living [syn: {taxidriver}, {taximan}, {cabdriver}, {cabman}, {cabby}, {hack driver}, {livery driver}]

1: rope or canvas headgear for a horse, with a rope for leading [syn: {halter}]

1: any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits [syn: {nettle tree}] 2: small edible dark purple to black berry with large pits; southern United Sta...

1: an obsolete firearm with a long barrel [syn: {arquebus}, {harquebus}, {hagbut}]

1: small striped semiterrestrial eastern American squirrel with cheek pouches [syn: {eastern chipmunk}, {striped squirrel}, {ground squirrel}, {Tamias striatus}]

1: stickweed; beggar's lice [syn: {genus Hackelia}, {Lappula}, {genus Lappula}]

1: someone who plays golf poorly 2: a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism [syn: {cyber-terrorist}, {cyberpunk}] ...

1: long slender feather on the necks of e.g. turkeys and pheasants v : comb with a heckle; "heckle hemp or flax" [syn: {heckle}, {hatchel}]

1: a feeling of anger and animosity; "having one's hackles or dander up" [syn: {dander}]

1: poplar of northeastern North America with broad heart-shaped leaves [syn: {balsam poplar}, {tacamahac}, {Populus balsamifera}]

1: a carriage for hire [syn: {hackney carriage}, {hackney coach}] 2: a compact breed of harness horse

1: a carriage for hire [syn: {hackney}, {hackney coach}]

1: a carriage for hire [syn: {hackney}, {hackney carriage}]

1: repeated too often; overfamiliar through overuse; "bromidic sermons"; "his remarks were trite and commonplace"; "hackneyed phrases"; "a stock answer"; "repeating threadbare jokes"; "parroting some ...

1: saw used with one hand for cutting metal [syn: {metal saw}] [also: {hacksawn}]

{hacksaw}

1: professional work done according to formula

{have}

{have a feeling}

1: act in one's own or everybody's best interest; "You will do well to arrive on time tomorrow!" [syn: {do well}]

1: (Islam) serious crimes committed by Muslims and punishable by pre-established punishments found in the Koran; "Had crimes include apostasy from Islam and murder and theft and adultery"

{have left}

{have the feeling}

1: relating to the deepest parts of the ocean (below 6000 meters)

{heder}

1: lean white flesh of fish similar to but smaller than cod; usually baked or poached or as fillets sauteed or fried 2: important food fish on both sides of the Atlantic; related to cod but usually sm...

1: of or relating to or characteristic of Hades or Tartarus [syn: {Plutonian}, {Tartarean}] n : the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,60...

1: the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)...

1: the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)...

1: the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)...

1: (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone [syn: {Pluto}, {Aides}, {Aidoneus}] 2: (religion) the world of the dead; "he didn't want ...

1: (Islam) a tradition based on reports of the sayings and activities of Muhammad and his companions 2: (Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and pr...

1: the fifth pillar of Islam is a pilgrimage to Mecca during the month of Dhu al-Qadah; at least once in a lifetime a Muslim is expected to make a religious journey to Mecca and the Kaaba; "for a Musl...

{hadj}

1: a pilgrim who journeys to Mecca [syn: {hajji}, {haji}]

1: Roman Emperor who was the adoptive son of Trajan; travelled throughout his empire to strengthen its frontiers and encourage learning and architecture; on a visit to Britain in 122 he ordered the co...

1: an ancient Roman wall built by Hadrian in the 2nd century; marked the northern boundary of the Roman Empire in Britain

1: any elementary particle that interacts strongly with other particles

1: any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic [syn: {hadrosaurus}, {duck-billed dinosaur}]

1: duck-billed dinosaurs; upper Cretaceous [syn: {family Hadrosauridae}]

1: any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic [syn: {hadrosaur}, {duck-billed dinosaur}]

1: the essence that makes something the kind of thing it is and makes it different from any other [syn: {quiddity}]

1: German biologist and philosopher; advocated Darwinism and formulated the theory of recapitulation; was an exponent of materialistic monism (1834-1919) [syn: {Ernst Heinrich Haeckel}]

1: a complex red organic pigment containing iron and other atoms to which oxygen binds [syn: {heme}, {hematin}, {haemitin}, {protoheme}]

1: cause the clumping together (of red blood cells) [syn: {hemagglutinate}]

1: agglutination of red blood cells [syn: {hemagglutination}]

1: relating to the blood vessels or blood [syn: {hemal}, {hematal}, {haematal}]

1: a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels [syn: {hemal arch}]

1: benign angioma consisting of a mass of blood vessels; some appear as birthmarks [syn: {hemangioma}]

1: genus of African deciduous or evergreen bulbous herbs: blood lilies [syn: {genus Haemanthus}]

1: spectacular plant having large prostrate leaves barred in reddish-purple and flowers with a clump of long yellow stamens in a coral-red cup of fleshy bracts; South Africa [syn: {Cape tulip}]

1: relating to the blood vessels or blood [syn: {hemal}, {haemal}, {hematal}]

1: vomiting blood [syn: {hematemesis}]

1: relating to or containing or affecting blood; "a hematic cyst"; "a hematic crisis" [syn: {hemic}, {haemic}, {hematic}]

1: a medicine that increases the hemoglobin content of the blood; used to treat iron-deficiency anemia [syn: {hematinic}]

1: the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form [syn: {hematite}]

1: European genus of bloodsucking flies [syn: {genus Haematobia}]

1: small black European fly introduced into North America; sucks blood from cattle especially at the base of the horn [syn: {horn fly}]

1: swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) [syn: {hematocele}, {hematocoele}, {haematocoele}]

1: passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer) [syn: {hematochezia}]

1: swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) [syn: {hematocele}, {haematocele}, {hematocoele}]

1: accumulation of blood in the vagina and uterus [syn: {hematocolpometra}]

1: accumulation of menstrual blood in the vagina (usually due to an imperforate hymen) [syn: {hematocolpos}]

1: the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit [syn: {hematocrit}, {packed cell volume}] 2: a measuring instrument to determ...

1: an abnormally low number of red blood cells in the blood [syn: {hematocytopenia}]

1: the presence of red blood cells in the urine [syn: {hematocyturia}]

1: the formation of blood cells in the living body (especially in the bone marrow) [syn: {hematopoiesis}, {haematopoiesis}, {hemopoiesis}, {haemopoiesis}, {hemogenesis}, {haemogenesis}, {hematogenesis...

1: pertaining to the formation of blood or blood cells; "hemopoietic stem cells in bone marrow" [syn: {hematopoietic}, {haematopoietic}, {hemopoietic}, {haemopoietic}, {hematogenic}]

1: a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells [syn: {globin}, {hematohiston}]

1: an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice [syn: {bilirubin}, {hematoidin}]

1: of or relating to or involved in hematology [syn: {hematologic}, {hematological}]

1: a doctor who specializes in diseases of the blood and blood-forming organs [syn: {hematologist}]

1: the branch of medicine that deals with diseases of the blood and blood-forming organs [syn: {hematology}]

{haematolysis}

1: lysis of erythrocytes with the release of hemoglobin [syn: {hemolysis}, {haemolysis}, {hematolysis}] [also: {haematolyses} (pl)]

1: a localized swelling filled with blood [syn: {hematoma}] [also: {haematomata} (pl)]

{haematoma}

1: oystercatchers [syn: {family Haematopodidae}]

1: the formation of blood cells in the living body (especially in the bone marrow) [syn: {hematopoiesis}, {hemopoiesis}, {haemopoiesis}, {hemogenesis}, {haemogenesis}, {hematogenesis}, {haematogenesis...

1: pertaining to the formation of blood or blood cells; "hemopoietic stem cells in bone marrow" [syn: {hematopoietic}, {hemopoietic}, {haemopoietic}, {hematogenic}, {haematogenic}]

1: oystercatchers [syn: {genus Haematopus}]

1: small genus of tropical American spiny bushy shrubs or trees [syn: {Haematoxylum}, {genus Haematoxylum}, {genus Haematoxylon}]

1: small genus of tropical American spiny bushy shrubs or trees [syn: {genus Haematoxylum}, {Haematoxylon}, {genus Haematoxylon}]

1: spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing...

{haematozoon}

1: the presence of blood in the urine; often a symptom of urinary tract disease [syn: {hematuria}]

1: relating to or containing or affecting blood; "a hematic cyst"; "a hematic crisis" [syn: {hemic}, {hematic}, {haematic}]

1: a complex red organic pigment containing iron and other atoms to which oxygen binds [syn: {heme}, {haem}, {hematin}, {protoheme}]

{haemodialysis}

1: dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure [syn: {hemodialysis}] [also: {haemodialyses} (pl)]

1: some genera placed in family Liliaceae [syn: {family Haemodoraceae}, {bloodwort family}]

1: type genus of family Haemodoraceae [syn: {genus Haemodorum}]

1: the formation of blood cells in the living body (especially in the bone marrow) [syn: {hematopoiesis}, {haematopoiesis}, {hemopoiesis}, {haemopoiesis}, {hemogenesis}, {hematogenesis}, {haematogenes...

1: a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemogl...

1: presence of excessive hemoglobin in the blood plasma [syn: {hemoglobinemia}]

1: a blood disease characterized by the presence of abnormal hemoglobins in the blood [syn: {hemoglobinopathy}]

1: presence of hemoglobin in the urine [syn: {hemoglobinuria}]

{haemolysis}

1: any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin [syn: {hemolysin}, {erythrolysin}, {erythrocytolysin}]

1: lysis of erythrocytes with the release of hemoglobin [syn: {hemolysis}, {hematolysis}, {haematolysis}] [also: {haemolyses} (pl)]

1: relating to or involving or causing hemolysis; "hemolytic anemia" [syn: {hemolytic}]

1: anemia resulting from destruction of erythrocytes [syn: {hemolytic anemia}]

1: someone who has hemophilia and is subject to uncontrollable bleeding [syn: {hemophiliac}, {haemophiliac}, {bleeder}, {hemophile}]

1: congenital tendency to uncontrolled bleeding; usually affects males and is transmitted from mother to son [syn: {hemophilia}, {bleeder's disease}]

1: hemophilia caused by a congenital deficiency of factor VIII; occurs almost exclusively in men [syn: {hemophilia A}, {classical hemophilia}, {classical haemophilia}]

1: a clotting disorder similar to hemophilia A but caused by a congenital deficiency of factor IX [syn: {hemophilia B}, {Christmas disease}]

1: someone who has hemophilia and is subject to uncontrollable bleeding [syn: {hemophiliac}, {bleeder}, {hemophile}, {haemophile}]

1: relating to or having hemophilia [syn: {hemophilic}]

1: leeches [syn: {genus Haemopis}]

1: the formation of blood cells in the living body (especially in the bone marrow) [syn: {hematopoiesis}, {haematopoiesis}, {hemopoiesis}, {hemogenesis}, {haemogenesis}, {hematogenesis}, {haematogenes...

1: pertaining to the formation of blood or blood cells; "hemopoietic stem cells in bone marrow" [syn: {hematopoietic}, {haematopoietic}, {hemopoietic}, {hematogenic}, {haematogenic}]

1: related to malaria parasite and having a phase in the viscera of various birds

1: bird parasites [syn: {family Haemoproteidae}]

1: a conjugated protein linked to an iron-porphyrin compound [syn: {hemoprotein}]

1: type genus of the family Haemoproteidae [syn: {genus Haemoproteus}]

{haemoptysis}

1: coughing up blood from the respiratory tract; usually indicates a severe infection of the bronchi or lungs [syn: {hemoptysis}] [also: {haemoptyses} (pl)]

1: flow of blood from a ruptured blood vessels [syn: {bleeding}, {hemorrhage}]

1: of or relating to a hemorrhage [syn: {hemorrhagic}]

1: a group of illnesses caused by a viral infection (usually restricted to a specific geographic area); fever and gastrointestinal symptoms are followed by capillary hemorrhage [syn: {hemorrhagic feve...

1: stroke caused by the rupture of a blood vessel in the brain [syn: {hemorrhagic stroke}]

1: pain caused by venous swelling at or inside the anal sphincter [syn: {hemorrhoid}, {piles}]

1: surgical procedure for tying hemorrhoids and excising them [syn: {hemorrhoidectomy}]

1: a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism [syn: {hemosiderin}]

1: abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis [syn: {hemosiderosis}]

1: an order in the subclass Telosporidia [syn: {order Haemosporidia}]

1: minute protozoans parasitic at some stage of the life cycle in blood cells of vertebrates including many pathogens

1: surgical procedure of stopping the flow of blood (as with a hemostat) [syn: {hemostasis}, {haemostasis}, {hemostasia}]