1: the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors" [syn: {type O}, {group O}] 2: a nonmetallic bivalent element that is normally a c...

1: the basic level of a subject taken in school

1: a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure

1: Irish writer (born in 1932) [syn: {Edna O'Brien}]

1: Irish playwright (1880-1964) [syn: {Sean O'Casey}]

1: according to the clock; "it's three o'clock in Tokyo now"

1: United States writer (1925-1964) [syn: {Flannery O'Connor}, {Mary Flannery O'Connor}]

1: throughout a period of time; "stay over the weekend" [syn: {over}]

1: Irish writer of short stories (1896-1984) [syn: {Liam O'Flaherty}]

1: United States writer (1905-1970) [syn: {John Henry O'Hara}]

1: United States painter (1887-1986) [syn: {Georgia Okeeffe}]

1: United States playwright (1888-1953) [syn: {Eugene O'Neill}, {Eugene Gladstone O'Neill}]

1: British actor (born in Ireland in 1932) [syn: {Peter O'Toole}, {Peter Seamus O'Toole}]

1: United States writer of short stories whose pen name was O. Henry (1862-1910) [syn: {Porter}, {William Sydney Porter}]

1: dose too heavily; "The rock star overdosed and was found dead in his hotel room" [syn: {overdose}]

1: an unabridged dictionary constructed on historical principles [syn: {Oxford English Dictionary}, {OED}]

1: being satisfactory or in satisfactory condition; "an all-right movie"; "the passengers were shaken up but are all right"; "is everything all right?"; "everything's fine"; "things are okay"; "dinner...

1: an awkward stupid person [syn: {lout}, {clod}, {stumblebum}, {goon}, {lubber}, {lummox}, {lump}, {gawk}]

1: ill-mannered and coarse and contemptible in behavior or appearance; "was boorish and insensitive"; "the loutish manners of a bully"; "her stupid oafish husband"; "aristocratic contempt for the swin...

1: an island of central Hawaii (between Molokai and Kauai); the chief island of the state [syn: {Oahu Island}]

1: an island of central Hawaii (between Molokai and Kauai); the chief island of the state [syn: {Oahu}]

1: the hard durable wood of any oak; used especially for furniture and flooring 2: a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns" [syn: {oak t...

1: oak gall caused by larvae of a cynipid wasp

1: a black plant louse that lives on oaks and dogwoods

1: a tree of the genus Castanopsis

1: bright blue-green fern widely distributed especially in damp acid woodlands of temperate northern hemisphere [syn: {Gymnocarpium dryopteris}, {Thelypteris dryopteris}]

1: a United States military decoration consisting of bronze or silver oak leaves and acorns awarded to anyone who has won a given medal before

1: a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns" [syn: {oak}]

1: annual European plant with spikes of greenish flowers and leaves that are white-hairy beneath; common as a weed in North America [syn: {oakleaf goosefoot}, {Chenopodium glaucum}]

1: consisting of or made of wood of the oak tree; "a solid oak table"; "the old oaken bucket"

1: a city in western California on San Francisco Bay opposite San Francisco; primarily and industrial urban center

1: annual European plant with spikes of greenish flowers and leaves that are white-hairy beneath; common as a weed in North America [syn: {oak-leaved goosefoot}, {Chenopodium glaucum}]

1: United States sharpshooter who was featured in Buffalo Bill's Wild West Show (1860-1926) [syn: {Annie Oakley}]

1: loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships

1: an implement used to propel or steer a boat

1: thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin [syn: {king of the herring}, {ribbonfish}, {Regalecus glesne}] [also: {oarfishes} (pl)]

{oarfish}

1: a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing [syn: {peg}, {pin}, {thole}, {tholepin}, {rowlock}]

1: someone who rows a boat [syn: {rower}]

1: skill as an oarsman

1: a woman oarsman

1: an association of countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation [syn: {Organization of American States}]

{oasis}

1: a fertile tract in a desert (where the water table approaches the surface) 2: a shelter serving as a place of safety or sanctuary [syn: {haven}] [also: {oases} (pl)]

1: a kiln for drying hops

1: a building containing an oast (a kiln for drying hops); usually has a conical or pyramidal roof

1: annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats') 2: seed of the annual grass Avena sativa (spoken of primarily in the plural as ...

1: highly malignant carcinoma composed of small round or egg-shaped cells with little cytoplasm; lung cancers are frequently oat cell carcinomas [syn: {small cell carcinoma}]

1: thin flat unleavened cake of baked oatmeal

1: of or related to or derived from oats; "oaten bread"

1: English conspirator who claimed that there was a Jesuit plot to assassinate Charles II (1649-1705) [syn: {Titus Oates}] 2: United States writer (born in 1938) [syn: {Joyce Carol Oates}]

1: profane or obscene expression usually of surprise or anger; "expletives were deleted" [syn: {curse}, {curse word}, {expletive}, {swearing}, {swearword}, {cuss}] 2: a commitment to tell the truth (e...

1: porridge made of rolled oats [syn: {burgoo}] 2: meal made from rolled or ground oats [syn: {rolled oats}]

1: cookies containing rolled oats

1: a city of southeastern Mexico [syn: {Oaxaca de Juarez}]

1: a city of southeastern Mexico [syn: {Oaxaca}]

1: a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea [syn: {Ob River}] 2: the branch of medicine dealing with childbirth and care of the mothe...

1: a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea [syn: {Ob}]

1: a Hebrew minor prophet [syn: {Abdias}] 2: an Old Testament book telling Obadiah's prophecies; the shortest book in the Christian Bible [syn: {Abdias}, {Book of Obadiah}]

1: a persistent but subordinate motif [syn: {obligato}] 2: a part of the score that must be performed without change or omission [syn: {obligato}]

1: resoluteness by virtue of being unyielding and inflexible [syn: {adamance}, {unyieldingness}]

1: stubbornly persistent in wrongdoing [syn: {cussed}, {obstinate}, {unrepentant}] 2: showing unfeeling resistance to tender feelings; "the child's misery would move even the most obdurate heart" [syn...

1: in a stubborn unregenerate manner; "she remained stubbornly in the same position" [syn: {stubbornly}, {pig-headedly}, {mulishly}, {obstinately}, {cussedly}]

1: a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas [syn: {obi}]

1: the wood of an African obeche tree; used especially for veneering 2: large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged s...

1: large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood [syn: {obeche}, {arere}, ...

1: the act of obeying; dutiful or submissive behavior with respect to another person [syn: {obeisance}] [ant: {disobedience}] 2: the trait of being willing to obey [ant: {disobedience}] 3: behavior in...

1: white-flowered West Indian plant whose root yields arrowroot starch [syn: {arrowroot}, {American arrowroot}, {Maranta arundinaceae}]

1: dutifully complying with the commands or instructions of those in authority; "an obedient soldier"; "obedient children"; "a little man obedient to his wife"; "the obedient colonies...are heavily ta...

1: North American plant having a spike of two-lipped pink or white flowers [syn: {false dragonhead}, {false dragon head}, {Physostegia virginiana}]

1: in an obedient manner; "obediently she slipped off her right shoe and stocking" [syn: {yieldingly}] [ant: {disobediently}]

1: bending the head or body or knee as a sign of reverence or submission or shame [syn: {bow}, {bowing}] 2: the act of obeying; dutiful or submissive behavior with respect to another person [syn: {obe...

{obelus}

1: the craniometric point on the sagittal suture near the lamboid suture

1: a stone pillar having a rectangular cross section tapering towards a pyramidal top 2: a character used in printing to indicate a cross reference or footnote [syn: {dagger}]

1: excessively fat; "a weighty man" [syn: {corpulent}, {weighty}, {rotund}]

1: more than average fatness [syn: {fleshiness}]

1: a diet designed to help you lose weight (especially fat) [syn: {reducing diet}]

1: be obedient to [ant: {disobey}]

1: make obscure or unclear [ant: {clarify}]

1: confusion resulting from failure to understand [syn: {bewilderment}, {puzzlement}, {befuddlement}, {mystification}, {bafflement}, {bemusement}] 2: the activity of obscuring people's understanding, ...

1: a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas [syn: {obeah}]

1: a chloride used as an antidote for nerve gases such as sarin or VX

1: belief in a kind of sorcery that originated in Africa and is practiced in the West Indies

1: a notice of someone's death; usually includes a short biography [syn: {obituary}, {necrology}]

1: an incidental remark [syn: {passing comment}] 2: an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding [syn: {dictum}]

1: a notice of someone's death; usually includes a short biography [syn: {obit}, {necrology}]

1: a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects" [syn: {physical object}] 2: the goal intended to be attained (and which is believe...

1: the billiard ball first struck by the cue ball

1: the machine-language output of a compiler that is ready for execution on a particular computer

1: the lens or system of lenses nearest the object being viewed [syn: {objective}]

1: a computer language into which something written in another computer language is to be translated [syn: {target language}] 2: the language into which a text written in another language is to be tra...

1: punishment intended as a warning to others; "they decided to make an example of him" [syn: {example}, {deterrent example}, {lesson}]

1: the object governed by a preposition [syn: {prepositional object}]

1: the object that receives the direct action of the verb [syn: {direct object}]

1: a fully compiled or assembled program ready to be loaded into the computer [syn: {target program}] [ant: {source program}]

1: the visual perception of familiar objects

1: a database in which the operations carried out on information items (data objects) are considered part of their definition

1: a database management system designed to manage an object-oriented database

1: (computer science) a programming language that enables the programmer to associate a set of procedures with each type of data structure; "C++ is an object-oriented programming language that is an e...

1: (computer science) a programming language that enables the programmer to associate a set of procedures with each type of data structure; "C++ is an object-oriented programming language that is an e...

1: the act of representing an abstraction as a physical thing 2: a concrete representation of an abstract idea or principle

{objectify}

1: make external or objective, or give reality to; "language externalizes our thoughts" [syn: {exteriorize}, {exteriorise}, {externalize}, {externalise}] 2: make impersonal or present as an object; "W...

1: the act of expressing earnest opposition or protest [syn: {expostulation}, {remonstrance}] 2: the speech act of objecting 3: the act of protesting; a public (often organized) manifestation of disse...

1: causing disapproval or protest; "a vulgar and objectionable person" [syn: {obnoxious}, {unpleasant}] 2: liable to objection or debate; used of something one might take exception to; "a thoroughly u...

1: the quality of being hateful [syn: {hatefulness}, {obnoxiousness}]

1: in an obnoxious manner; "he said so in one of his more offensively intellectually arrogant sentences" [syn: {offensively}, {obnoxiously}]

1: undistorted by emotion or personal bias; based on observable phenomena; "an objective appraisal"; "objective evidence" [syn: {nonsubjective}] [ant: {subjective}] 2: serving as or indicating the obj...

1: the category of nouns serving as the direct object of a verb [syn: {accusative}, {accusative case}]

1: with objectivity; "we must look at the facts objectively" [ant: {subjectively}]

1: judgment based on observable phenomena and uninfluenced by emotions or personal prejudices [syn: {objectivity}]

1: judgment based on observable phenomena and uninfluenced by emotions or personal prejudices [syn: {objectiveness}]

1: a person who dissents from some established policy [syn: {dissenter}, {dissident}, {protester}, {contestant}]

1: a work of art of some artistic value; "this store sells only objets d'art"; "it is not known who created this piece" [syn: {art object}, {piece}]

{objet d'art}

1: express strong disapproval of; "We condemn the racism in South Africa"; "These ideas were reprobated" [syn: {condemn}, {reprobate}, {decry}, {excoriate}] 2: censure severely; "She chastised him for...

1: rebuking a person harshly [syn: {chiding}, {scolding}, {tongue-lashing}]

1: of a leaf shape; having a broad rounded apex and a tapering base

1: having a rounded apex and tapering base

1: having the equatorial diameter greater than the polar diameter; being flattened at the poles [syn: {pumpkin-shaped}] [ant: {prolate}] n : a lay person dedicated to religious work or the religious l...

1: the property possessed by a rounded shape that is flattened at the poles; "the oblateness of the planet" [syn: {ellipticity}]

1: the act of contributing to the funds of a church or charity; "oblations for aid to the poor" [syn: {offering}] 2: the act of offering the bread and wine of the Eucharist [syn: {religious offering}]

1: restricted to a particular condition of life; "an obligate anaerobe can survive only in the absence of OXYGen" [ant: {facultative}] v 1: force or compel somebody to do something; "We compel all stu...

1: an organism that cannot grow in the presence of oxygen

1: caused by law or conscience to follow a certain course; "felt obligated to repay the kindness"; "was obligated to pay off the student loan" [syn: {obligated(p)}] [ant: {unobligated}]

{obligato}

1: the social force that binds you to your obligations and the courses of action demanded by that force; "we must instill a sense of duty in our children"; "every right implies a responsibility; every...

1: relating or constituting or qualified to create a legal or financial obligation; "obligational authority"

1: a persistent but subordinate motif [syn: {obbligato}] 2: a part of the score that must be performed without change or omission [syn: {obbligato}] [also: {obligati} (pl)]

1: in an obligatory manner; "this rule applies obligatorily" [ant: {optionally}] 2: in a manner that cannot be evaded; "the ministry considers that contributions to such a fund should be met from volu...

1: morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution" [ant: {optional}] 2: required by obligation or compulsion or convention; "he made all the obliga...

1: force or compel somebody to do something; "We compel all students to fill out this form" [syn: {compel}, {obligate}] 2: bind by an obligation; cause to be indebted; "He's held by a contract"; "I'll...

1: under a moral obligation to do something [syn: {duty-bound(p)}, {obliged(p)}]

1: someone who performs a service or does a favor [syn: {accommodator}]

1: happy to comply [syn: {complying}, {yielding}] 2: showing a cheerful willingness to do favors for others; "to close one's eyes like a complaisant husband whose wife has taken a lover"; "the obligin...

1: in accommodation; "obligingly, he lowered his voice" [syn: {accommodatingly}]

1: a disposition or tendency to yield to the will of others [syn: {complaisance}, {compliance}, {compliancy}, {deference}]

1: slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angular; "the oblique rays of the winter sun"; "acute and obtuse angles are oblique angles"; "t...

1: an angle that is not a right angle or a multiple of a right angle [ant: {right angle}]

1: a bandage in which successive turns proceed obliquely up or down a limb

1: any grammatical case other than the nominative [syn: {oblique}] [ant: {nominative}]

1: a triangle that contains no right angle [ant: {right triangle}]

1: a tributary of the coronary sinus; on the posterior wall of the left atrium [syn: {vena obliqua atrii sinistri}]

1: to, toward or at one side; "darting eyes looking sidelong out of a wizened face" [syn: {sidelong}, {sideways}] 2: at an oblique angle; "the sun shone aslant into his face" [syn: {aslant}, {athwart}...

1: the property of being neither parallel nor perpendicular, but at a slanting angle 2: the quality of being oblique and rambling indirectly [syn: {deviousness}]

1: the presentation during labor of the head of the fetus at an abnormal angle [syn: {asynclitism}] 2: the quality of being deceptive [syn: {deceptiveness}]

1: able to be obliterated completely [syn: {removable}]

1: reduced to nothingness [syn: {blotted out}, {obliterated}] v 1: mark for deletion, rub off, or erase; "kill these lines in the President's speech" [syn: {kill}, {wipe out}] 2: make undecipherable o...

1: reduced to nothingness [syn: {blotted out}, {obliterate}]

1: making undecipherable or imperceptible; "obliterating mists"; "an obscurant bank of clouds" [syn: {obscurant}]

1: destruction by annihilating something [syn: {annihilation}] 2: the complete destruction of every trace of something [syn: {eradication}]

1: an eliminator that does away with all traces

1: the state of being disregarded or forgotten [syn: {limbo}] 2: total forgetfulness; "he sought the great oblivion of sleep" [syn: {obliviousness}]

1: (followed by `to' or `of') lacking conscious awareness of; "oblivious of the mounting pressures for political reform"; "oblivious to the risks she ran"; "not unmindful of the heavy responsibility" ...

1: total forgetfulness; "he sought the great oblivion of sleep" [syn: {oblivion}]

1: of a leaf shape; having a somewhat elongated form with approximately parallel sides 2: deviating from a square or circle or sphere by being elongated in one direction n : a plane figure that deviat...

1: rounded at each end with parallel sides

1: a common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate fronds [syn: {rusty woodsia}, {fragrant woodsia}, {Woodsia ilvensis}]

1: the property of being shaped like a rectangle [syn: {rectangularity}]

1: state of disgrace resulting from public abuse [syn: {opprobrium}] 2: a malicious attack [syn: {defamation}, {calumny}, {traducement}, {hatchet job}]

1: causing disapproval or protest; "a vulgar and objectionable person" [syn: {objectionable}, {unpleasant}]

1: in an obnoxious manner; "he said so in one of his more offensively intellectually arrogant sentences" [syn: {offensively}, {objectionably}]

1: the quality of being hateful [syn: {hatefulness}, {objectionableness}]

1: make less visible or unclear; "The stars are obscured by the clouds" [syn: {obscure}, {befog}, {becloud}, {haze over}, {fog}, {cloud}, {mist}] 2: make unclear, indistinct, or blurred; "Her remarks ...

1: a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece [syn: {hautboy}, {hautbois}]

1: a oboe pitched a minor third lower than the ordinary oboe; used to perform baroque music

1: an alto oboe; precursor of the English horn

1: a musician who plays the oboe

{obolus}

1: a Greek unit of weight equal to one tenth of a gram [also: {oboli} (pl)]

1: of a leaf shape; egg-shaped with the narrower end at the base

1: egg-shaped with the narrower end at the base

1: designed to incite to indecency or lust; "the dance often becomes flagrantly obscene"- Margaret Mead 2: offensive to the mind; "an abhorrent deed"; "the obscene massacre at Wounded Knee"; "morally ...

1: to an obscene degree; "this man is obscenely rich" 2: in a lewd and obscene manner; "he had seen how in their dances the white men and women held one another obscenely" [syn: {lewdly}]

1: the trait of behaving in an obscene manner [syn: {lewdness}, {bawdiness}, {salaciousness}, {salacity}] 2: an offensive or indecent word or phrase [syn: {vulgarism}, {dirty word}] 3: an obscene act

1: making undecipherable or imperceptible; "obliterating mists"; "an obscurant bank of clouds" [syn: {obliterating}]

1: a policy of opposition to enlightenment or the spread of knowledge 2: a deliberate act intended to make something obscure

1: a person who is deliberately vague

1: not clearly understood or expressed; "an obscure turn of phrase"; "an impulse to go off and fight certain obscure battles of his own spirit"-Anatole Broyard; "their descriptions of human behavior b...

1: in an obscure manner; "this work is obscurely written"

1: the state of being humble and unimportant [syn: {humbleness}, {unimportance}] 2: the state of being indistinct or indefinite for lack of adequate illumination [syn: {obscurity}] 3: the quality of b...

1: the quality of being unclear or abstruse and hard to understand [syn: {obscureness}, {abstruseness}, {reconditeness}] [ant: {clarity}] 2: an obscure and unimportant standing; not well known; "he wo...

1: attempting to win favor from influential people by flattery [syn: {bootlicking}, {fawning}, {sycophantic}, {toadyish}] 2: attentive in an ingratiating or servile manner; "obsequious shop assistants...

1: in an obsequious manner; "she acts obsequiously toward her boss" [syn: {subserviently}, {servilely}]

1: abject or cringing submissiveness [syn: {servility}, {subservience}]

1: capable of being seen or noticed; "a discernible change in attitude"; "a clearly evident erasure in the manuscript"; "an observable change in behavior" [syn: {discernible}, {evident}]

1: in an imperceptible manner or to an imperceptible degree; "the power of the Secretary of State in London increased gradually but imperceptibly" [syn: {imperceptibly}, {unnoticeably}] [ant: {percept...

1: the act of observing; taking a patient look [syn: {observation}, {watching}] 2: a formal event performed on a special occasion; "a ceremony commemorating Pearl Harbor" [syn: {ceremony}, {ceremonial...

1: paying close attention especially to details 2: quick to notice; showing quick and keen perception [syn: {observing}] 3: (of individuals) adhering strictly to laws and rules and customs; "law-abidi...

1: in an observant manner [syn: {observingly}]

1: the act of making and recording a measurement 2: the act of observing; taking a patient look [syn: {observance}, {watching}] 3: facts learned by observing; "he reported his observations to the mayo...

1: lookout consisting of a dome-shaped observatory

1: an elevated post affording a wide view [syn: {lookout}]

1: a station set up for making observations of something

1: a structure commanding a wide view of its surroundings [syn: {lookout}, {lookout station}, {observatory}]

1: relying on observation or experiment; "experimental results that supported the hypothesis" [syn: {experimental}, {data-based}]

1: a building designed and equipped to observe astronomical phenomena 2: a structure commanding a wide view of its surroundings [syn: {lookout}, {observation tower}, {lookout station}]

1: discover or determine the existence, presence, or fact of; "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint" [syn: {detect}, {find}, {discover}, {noti...

1: discovered or determined by scientific observation; "variation in the ascertained flux depends on a number of factors"; "the discovered behavior norms"; "discovered differences in achievement"; "no...