{aciculum} [also: {aciculae} (pl)]

{acicula}

1: narrow and long and pointed; as pine leaves [syn: {acerate}, {acerose}, {needle-shaped}]

1: related to plants or animals or crystals having aciculae or needle-like parts

1: harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "cau...

1: organic compounds that react with water to form an acid [syn: {acyl anhydrides}]

1: dye in which the chromophore is part of a negative ion

1: organic compounds containing the group -COX where X is a halogen atom [syn: {acyl halide}]

1: someone who takes LSD

1: a hydrogen atom in an acid that forms a positive ion when the acid dissociates [syn: {acidic hydrogen}]

1: rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water [syn: {acid rain}]

1: rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water [syn: {acid precipitation}]

1: a musical style that emerged in the mid-1960s; rock music inspired by or related to drug-induced experience [syn: {psychedelic rock}]

1: a rigorous or crucial appraisal

1: (chemistry) the amount of free acid present in fat as measured by the milligrams of potassium hydroxide needed to neutralize it; "as the glycerides in fat slowly decompose the acid value increases"

1: (physiology) the normal equilibrium between acids and alkalis in the body; "with a normal acid-base balance in the body the blood is slightly alkaline" [syn: {acid-base equilibrium}]

1: (physiology) the normal equilibrium between acids and alkalis in the body; "with a normal acid-base balance in the body the blood is slightly alkaline" [syn: {acid-base balance}]

1: an indicator that changes color on going from acidic to basic solutions

1: not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)

1: yielding an acid in aqueous solution

1: thriving in a relatively acidic environment (especially of plants requiring a pH well below 7) [ant: {alkaline-loving}]

1: wash with acid so as to achieve a bleached look; "acid-wash blue jeans"

1: a blood disorder characterized by an increased concentration of hydrogen ions in the blood (which falls below 7 on the pH scale)

1: being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) [ant: {alkaline}, {amphoteric}] 2: tasting sour like acid [syn: {acidulent}, {acidulous}]

1: a hydrogen atom in an acid that forms a positive ion when the acid dissociates [syn: {acid hydrogen}]

1: the process of becoming acid or being converted into an acid

{acidify}

1: make sour or more sour [syn: {sour}, {acidulate}, {acetify}] [ant: {sweeten}] 2: turn acidic; "the solution acetified" [syn: {acetify}] [ant: {alkalize}] [also: {acidified}]

1: involving or related to acidimetry

1: volumetric analysis using standard solutions of acids to measure the amount of a base present

1: the property of being acidic [syn: {sourness}, {sour}] 2: the taste experience when something acidic is taken into the mouth [syn: {acidulousness}] 3: pH values below 7 [ant: {alkalinity}]

1: an organism that thrives in a relatively acid environment [syn: {acidophile}]

1: an organism that thrives in a relatively acid environment [syn: {acidophil}]

1: especially of some bacteria; growing well in an acid medium [syn: {acidophilous}, {aciduric}]

1: especially of some bacteria; growing well in an acid medium [syn: {acidophilic}, {aciduric}]

1: milk fermented by bacteria; used to treat gastrointestinal disorders

1: abnormally high acidity (excess hydrogen-ion concentration) of the blood and other body tissues

1: having or being characterized by acidosis

1: make sour or more sour [syn: {sour}, {acidify}, {acetify}] [ant: {sweeten}]

1: made slightly acid

1: tasting sour like acid [syn: {acidic}, {acidulous}]

1: tasting sour like acid [syn: {acidic}, {acidulent}]

1: the taste experience when something acidic is taken into the mouth [syn: {acidity}]

1: especially of some bacteria; growing well in an acid medium [syn: {acidophilic}, {acidophilous}]

1: pertaining to one of the small sacs (as in a compound gland) [syn: {acinous}, {acinose}, {acinic}] 2: pertaining to the individual parts making up an aggregate fruit like a blackberry

{acinus}

1: pertaining to one of the small sacs (as in a compound gland) [syn: {acinar}, {acinous}, {acinose}]

1: cheetahs [syn: {genus Acinonyx}]

1: long-legged spotted cat of Africa and southwestern Asia having nonretractile claws; the swiftest mammal; can be trained to run down game [syn: {cheetah}, {chetah}]

1: plants closely allied to the genera Satureja and Calamintha [syn: {genus Acinos}]

1: fragrant European mint having clusters of small violet-and-white flowers; naturalized especially in eastern North America [syn: {basil thyme}, {basil balm}, {mother of thyme}, {Satureja acinos}]

1: pertaining to one of the small sacs (as in a compound gland) [syn: {acinar}, {acinous}, {acinic}]

1: pertaining to one of the small sacs (as in a compound gland) [syn: {acinar}, {acinose}, {acinic}]

1: one of the small drupes making up an aggregate or multiple fruit like a blackberry 2: one of the small sacs or saclike dilations in a compound gland [also: {acini} (pl)]

1: type genus of the Acipenseridae: sturgeons [syn: {genus Acipenser}]

1: valuable source of caviar and isinglass; found in Black and Caspian seas [syn: {beluga}, {hausen}, {white sturgeon}]

1: food and game fish of marine and fresh waters of northwestern coast of North America [syn: {Pacific sturgeon}, {white sturgeon}, {Sacramento sturgeon}]

1: sturgeons [syn: {family Acipenseridae}]

1: artillery designed to shoot upward at airplanes [syn: {antiaircraft}, {antiaircraft gun}, {flak}, {flack}, {pom-pom}, {ack-ack gun}]

1: artillery designed to shoot upward at airplanes [syn: {antiaircraft}, {antiaircraft gun}, {flak}, {flack}, {pom-pom}, {ack-ack}]

1: red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe [syn: {akee}]

1: declare to be true or admit the existence or reality or truth of; "He admitted his errors"; "She acknowledged that she might have forgotten" [syn: {admit}] [ant: {deny}] 2: report the receipt of; "...

1: capable of being acknowledged

1: recognized or made known or admitted; "the acknowledged leader of the community"; "a woman of acknowledged accomplishments"; "his acknowledged error" [ant: {unacknowledged}] 2: generally accepted

1: the state or quality of being recognized or acknowledged; "the partners were delighted with the recognition of their work"; "she seems to avoid much in the way of recognition or acknowledgement of ...

1: the state or quality of being recognized or acknowledged; "the partners were delighted with the recognition of their work"; "she seems to avoid much in the way of recognition or acknowledgement of ...

1: a major strategic headquarters of NATO located in the United States; is under the authority of the North Atlantic Council [syn: {Allied Command Atlantic}]

1: an imaginary line paralleling the equator where a magnetic needle has no dip [syn: {magnetic equator}]

1: the highest level or degree attainable; "his landscapes were deemed the acme of beauty"; "the artist's gifts are at their acme"; "at the height of her career"; "the peak of perfection"; "summer was...

1: an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones

1: a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance [syn: {rosacea}]

1: the most common form of acne; usually affects people from puberty to young adulthood

1: (of complexion) blemished by imperfections of the skin [syn: {pimpled}, {pimply}, {pustulate}]

1: resembling acne

1: a subclass of Sporozoa [syn: {subclass Acnidosporidia}]

1: small genus of trees and shrubs containing strongly toxic cardiac glycosides; Arabia to Africa [syn: {genus Acocanthera}, {Acokanthera}, {genus Acokanthera}]

1: medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits [syn: {winter sweet}, {poison arrow p...

1: evergreen shrub or tree of South Africa [syn: {bushman's poison}, {ordeal tree}, {Acocanthera venenata}]

1: medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits [syn: {winter sweet}, {poison arrow p...

1: evergreen shrub or tree of South Africa [syn: {bushman's poison}, {ordeal tree}, {Acocanthera oppositifolia}]

1: small genus of trees and shrubs containing strongly toxic cardiac glycosides; Arabia to Africa [syn: {Acocanthera}, {genus Acocanthera}, {genus Acokanthera}]

1: of persons; feeling cold; "Poor Tom's acold"- Shakespeare

1: someone who assists a priest or minister in a liturgical service; a cleric ordained in the highest of the minor orders in the Roman Catholic Church but not in the Anglican Church or the Eastern Ort...

1: the highest mountain in the western hemisphere; located in the Andes in western Argentina (22,834 feet high)

1: any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers

1: genus of poisonous plants of temperate regions of northern hemisphere with a vaulted and enlarged petal [syn: {genus Aconitum}]

1: poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock [syn: {wolfsbane}, {wolfbane}, {wolf's bane}]

1: a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite [syn: {monkshood}, {helmetflower}, {helmet flower}]

1: used in some classifications for the genus Acorus which is usually assigned to Araceae [syn: {subfamily Acoraceae}]

1: absence of the pupil in an eye

1: islands in the Atlantic Ocean belonging to Portugal; "the Azores are strategically located on transatlantic air and shipping routes" [syn: {Azores}]

1: fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base

1: barnacle that attaches to rocks especially in intertidal zones [syn: {rock barnacle}, {Balanus balanoides}]

1: cup-shaped structure of hardened bracts at the base of an acorn [syn: {cupule}]

1: squash plant bearing small acorn-shaped fruits having yellow flesh and dark green or yellow rind with longitudinal ridges 2: small dark green or yellow ribbed squash with yellow to orange flesh

1: a small vacuum tube; used at high frequencies

1: sweet flags; sometimes placed in subfamily Acoraceae [syn: {genus Acorus}]

1: perennial marsh plant having swordlike leaves and aromatic roots [syn: {sweet flag}, {calamus}, {sweet calamus}, {myrtle flag}, {flagroot}]

1: illusory auditory perception of strange nonverbal sounds [syn: {auditory hallucination}]

1: of or relating to the science of acoustics; "acoustic properties of a hall" [syn: {acoustical}] n : a remedy for hearing loss or deafness

1: an impairment in understanding spoken language that is not attributable to hearing loss [syn: {auditory aphasia}, {word deafness}]

1: a buoy that can be heard (at night)

1: a delay line based on the time of propagation of sound waves [syn: {sonic delay line}]

1: a device for amplifying or transmitting sound

1: an antique record player; the sound of the vibrating needle is amplified acoustically [syn: {gramophone}]

1: sound is not amplified by electrical means

1: opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component [syn: {acoustic resistance}, {ac...

1: either of the passages in the outer ear from the auricle to the tympanic membrane [syn: {auditory meatus}, {ear canal}, {auditory canal}, {external auditory canal}]

1: a modem that converts electrical signals to telephone tones and back again

1: a composite sensory nerve supplying the hair cells of the vestibular organ and the hair cells of the cochlea [syn: {auditory nerve}, {vestibulocochlear nerve}, {nervus vestibulocochlearis}, {eighth...

1: a physical phenomenon associated with the production or transmission of sound

1: the physical intensity of sound [syn: {sound pressure level}]

1: the acoustic phenomenon that gives sound a penetrating quality; "our ukuleles have been designed to have superior sound and projection"; "a prime ingredient of public speaking is projection of the ...

1: (acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound wave

1: opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component [syn: {acoustic resistance}, {ac...

1: opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component [syn: {acoustic impedance}, {aco...

1: the distribution of energy as a function of frequency for a particular sound source [syn: {sound spectrum}]

1: a storage device consisting of acoustic delay lines

1: (acoustics) a wave that transmits sound [syn: {sound wave}]

1: of or relating to the science of acoustics; "acoustic properties of a hall" [syn: {acoustic}]

1: with respect to acoustics; "acoustically ill-equipped studios"

1: a physicist who specializes in acoustics

1: a morbid fear of sounds including your own voice [syn: {phonophobia}]

1: the study of the physical properties of sound

1: cause to come to know personally; "permit me to acquaint you with my son"; "introduce the new neighbors to the community" [syn: {introduce}, {present}] 2: make familiar or acquainted; "you should a...

1: personal knowledge or information about someone or something [syn: {familiarity}, {conversance}, {conversancy}] 2: a relationship less intimate than friendship [syn: {acquaintanceship}] 3: a person...

1: a relationship less intimate than friendship [syn: {acquaintance}]

1: having fair knowledge of; "they were acquainted"; "fully acquainted with the facts" [syn: {acquainted(p)}, {acquainted with(p)}, {familiar with(p)}]

1: having fair knowledge of; "they were acquainted"; "fully acquainted with the facts" [syn: {acquainted(p)}, {acquainted with(p)}, {familiar with(p)}]

1: to agree or express agreement; "The Maestro assented to the request for an encore" [syn: {assent}, {accede}] [ant: {dissent}]

1: acceptance without protest 2: agreement with a statement or proposal to do something; "he gave his assent eagerly"; "a murmur of acquiescence from the assembly" [syn: {assent}]

1: willing to carry out the orders or wishes of another without protest; "too acquiescent to challenge authority"; "a gentle and biddable soul"; "children compliant with the parental will" [syn: {bidd...

1: capable of being acquired

1: come into the possession of something concrete or abstract; "She got a lot of paintings from her uncle"; "They acquired a new pet"; "Get your results the next day"; "Get permission to take a few da...

1: gotten through environmental forces; "acquired characteristics (such as a suntan or a broken nose) cannot be passed on"

1: hemochromatosis resulting from repeated transfusions or from excessive intake of foods containing iron

1: a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles [syn: {AIDS}]

1: immunity to a particular disease that is not innate but has been acquired during life; immunity can be acquired by the development of antibodies after an attack of an infectious disease or by a pre...

1: an acquired response that is under the control of (conditional on the occurrence of) a stimulus [syn: {conditional reflex}, {conditioned reflex}, {conditional reaction}, {conditioned reaction}, {co...

1: a preference that is only acquired after considerable experience; "martinis are an acquired taste"

1: an ability that has been acquired by training [syn: {skill}, {accomplishment}, {acquisition}, {attainment}]

1: a person who acquires something (usually permanently) 2: a bank gaining financial control over another financial institution through a payment in cash or an exchange of stock 3: the financial insti...

1: the act of acquiring something; "I envied his talent for acquiring"; "he's much more interested in the getting than in the giving" [syn: {getting}]

1: the act of contracting or assuming or acquiring possession of something; "the acquisition of wealth"; "the acquisition of one company by another" 2: something acquired; "a recent acquisition by the...

1: contract governing the merger of two or more companies [syn: {merger agreement}]

1: eager to acquire and possess things especially material possessions or ideas; "an acquisitive mind"; "an aquisitive society in which the craving for material things seems never satisfied" [ant: {un...

1: strong desire to acquire and possess

1: pronounce not guilty of criminal charges; "The suspect was cleared of the murder charges" [syn: {assoil}, {clear}, {discharge}, {exonerate}, {exculpate}] [ant: {convict}] 2: behave in a certain man...

1: a judgment of not guilty [ant: {conviction}]

1: a legal document evidencing the discharge of a debt or obligation [syn: {release}]

{acquit}

{acquit}

1: a town in Italy in southwestern Sicily near the coast; the site of six Greek temples [syn: {Agrigento}, {Girgenti}]

1: cellular slime molds; in some classifications placed in Kingdom Protoctista [syn: {class Acrasiomycetes}]

1: a unit of area (4840 square yards) used in English-speaking countries 2: a territory of western Brazil bordering on Bolivia and Peru 3: a town and port in northwestern Israel in the eastern Mediter...

1: one twelfth of an acre-foot

{acre-foot}

1: the volume of water that would cover 1 acre to a depth of 1 foot; 43,560 cubic feet or 1233.5 cubic meters [also: {acre-feet} (pl)]

1: an area of ground used for some particular purpose (such as building or farming); "he wanted some acreage to build on" [syn: {land area}]

1: extensive landed property (especially in the country) retained by the owner for his own use; "the family owned a large estate on Long Island" [syn: {estate}, {land}, {landed estate}, {demesne}]

1: strong and sharp; "the acrid smell of burning rubber" 2: harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her ma...

1: grasshopper with short antennae [syn: {short-horned grasshopper}]

1: short-horned grasshoppers; true locusts [syn: {family Acrididae}, {Locustidae}, {family Locustidae}]

1: having an acrid smell 2: extreme bitterness; "the acridity of alkali" [syn: {acridness}] 3: the quality of being sharply disagreeable in language or tone [syn: {acridness}]

1: extreme bitterness; "the acridity of alkali" [syn: {acridity}] 2: the quality of being sharply disagreeable in language or tone [syn: {acridity}]

1: mynas [syn: {genus Acridotheres}]

1: dark brown crested bird of southeastern Asia [syn: {crested myna}]

1: acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) [syn: {polypropenonitrile}]

1: marked by strong resentment or cynicism; "an acrimonious dispute"; "bitter about the divorce" [syn: {bitter}]

1: a sharp and bitter manner [syn: {bitterness}, {acerbity}, {jaundice}]

1: cricket frogs [syn: {genus Acris}]

1: of eastern and central United States [syn: {northern cricket frog}]

1: cricket frog of eastern United States [syn: {eastern cricket frog}]

1: without a crisis (as of some diseases)

1: loss of sensation in the extremities [syn: {acroanesthesia}]

1: loss of sensation in the extremities [syn: {acroanaesthesia}]

1: an athlete who performs acts requiring skill and agility and coordination

1: a genus of Phalangeridae [syn: {genus Acrobates}]

1: vigorously active; "an acrobatic dance"; "an athletic child"; "athletic playing"; "gymnastic exercises" [syn: {athletic}, {gymnastic}]

1: a stunt performed by an acrobat [syn: {acrobatic stunt}]

1: a stunt performed by an acrobat [syn: {acrobatic feat}]

1: the gymnastic moves of an acrobat [syn: {tumbling}] 2: the performance of stunts while in flight in an aircraft [syn: {aerobatics}, {stunting}, {stunt flying}]

1: a moss in which the main axis is terminated by the archegonium (and hence the capsule) [syn: {acrocarpous moss}] [ant: {pleurocarp}]

1: (of mosses) having the archegonia at the top of the stem [ant: {pleurocarpous}]

1: a moss in which the main axis is terminated by the archegonium (and hence the capsule) [syn: {acrocarp}] [ant: {pleurocarp}]

1: small genus of trees of Indonesia and Malaysia [syn: {genus Acrocarpus}]

1: East Indian timber tree with hard durable wood used especially for tea boxes [syn: {shingle tree}]

1: having a subterminal centromere; "an acrocentric chromosome"

1: a chromosome with the centromere near one end so that one chromosomal arm is short and one is long

1: a genus of Sylviidae [syn: {genus Acrocephalus}]

1: small European warbler that breeds among reeds and wedges and winters in Africa [syn: {sedge warbler}, {sedge bird}, {sedge wren}, {reedbird}]

1: a congenital abnormality of the skull; the top of the skull assumes a cone shape [syn: {oxycephaly}]

1: genus of herbs and shrubs of Australia and South Africa: everlasting flower; most species usually placed in genus Helipterum [syn: {genus Acroclinium}]

1: flower of southwestern Australia having bright pink daisylike papery flowers; grown for drying [syn: {pink-and-white everlasting}, {pink paper daisy}]

1: Central and South American feather palms [syn: {genus Acrocomia}]

1: tropical American feather palm having a swollen spiny trunk and edible nuts [syn: {grugru}, {gri-gri}, {grugru palm}, {macamba}]

1: tropical American palm having edible nuts and yielding a useful fiber [syn: {coyol}, {coyol palm}]

1: cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion [syn: {Raynaud's sign}]

1: an animal having teeth consolidated with the summit of the alveolar ridge without sockets

1: any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem