| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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| angel | (noun) spiritual being attendant upon God | - |
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| (noun) someone who provides financial support for some venture | Synonyms: backer |
| (noun) person of exceptional holiness | Synonyms: holy man, holy person, saint |
| angelfish | (noun) sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do | Synonyms: angel shark, monkfish, Squatina squatina |
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| (noun) a butterfly fish of the genus Pomacanthus | - |
| (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: Chaetodipterus faber, spadefish |
| angelica | (noun) aromatic stems or leaves or roots of Angelica Archangelica | - |
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| (noun) candied stalks of the angelica plant | - |
| (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelique |
| angelim | (noun) any of several tropical American trees of the genus Andira | Synonyms: andelmin |
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| angelique | (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelica |
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| angelology | (noun) the branch of theology that is concerned with angels | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| angiohemophilia | (noun) a form of hemophilia discovered by Erik von Willebrand; a genetic disorder that is inherited as an autosomal recessive trait; characterized by a deficiency of the coagulation factor and by mucosal bleeding | Synonyms: vascular hemophilia, von Willebrand's disease |
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| angiologist | (noun) a physician who specializes in angiology | - |
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| angiology | (noun) the branch of medical science that studies the blood and lymph vessels and their disorders | - |
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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| angle | (noun) a biased way of looking at or presenting something | Synonyms: slant |
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| (noun) the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians | - |
| angledozer | (noun) a bulldozer with an angled moldboard to push earth to one side | - |
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| angler | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| (noun) a fisherman who uses a hook and line | Synonyms: troller |
| (noun) a scheming person; someone who schemes to gain an advantage | - |
| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| anglewing | (noun) nymphalid butterfly having angular notches on the outer edges of the forewings | - |
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| angleworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler |
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| angling | (noun) fishing with a hook and line (and usually a pole) | - |
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| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anglophile | (noun) an admirer of England and things English | Synonyms: anglophil |
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| anglophobe | (noun) a person who hates England and everything English | - |
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| angularity | (noun) the property possessed by a shape that has angles | - |
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| (noun) a shape having one or more sharp angles | Synonyms: angular shape |
| angulation | (noun) the act of making angulate (having corners) | - |
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| (noun) the precise measurement of angles | - |
| anil | (noun) shrub of West Indies and South America that is a source of indigo dye | Synonyms: Indigofera anil, Indigofera suffruticosa |
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| (noun) a blue dye obtained from plants or made synthetically | Synonyms: indigo, indigotin |
| aniline | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline oil, phenylamine |
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| animal | (noun) a living organism characterized by voluntary movement | Synonyms: animate being, beast, brute, creature, fauna |
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| animalcule | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalculum |
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| animalculum | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalcule |
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| animalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalization, brutalisation, brutalization |
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| animalism | (noun) preoccupation with satisfaction of physical drives and appetites | Synonyms: physicality |
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| (noun) the doctrine that human beings are purely animal in nature and lacking a spiritual nature | - |
| animality | (noun) the physical (or animal) side of a person as opposed to the spirit or intellect | Synonyms: animal nature |
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| animalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, brutalisation, brutalization |
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| (noun) a depiction in the form of an animal | - |
| ankle | (noun) a gliding joint between the distal ends of the tibia and fibula and the proximal end of the talus | Synonyms: ankle joint, articulatio talocruralis, mortise joint |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| anklet | (noun) an ornament worn around the ankle | Synonyms: ankle bracelet |
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| (noun) a sock that reaches just above the ankle | Synonyms: anklets, bobbysock, bobbysocks |
| (noun) a shoe for a child or woman that has a strap around the ankle | - |
| anklets | (noun) a sock that reaches just above the ankle | Synonyms: anklet, bobbysock, bobbysocks |
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| ankyloglossia | (noun) a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue | Synonyms: tongue tie |
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| ankylosaur | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaurus |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| ankylosis | (noun) abnormal adhesion and rigidity of the bones of a joint | Synonyms: anchylosis |
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| anlage | (noun) an organ in its earliest stage of development; the foundation for subsequent development | Synonyms: primordium |
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| annalism | (noun) The writing of annals. | - |
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| annalist | (noun) a historian who writes annals | - |
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| annals | (noun) a chronological account of events in successive years | Synonyms: chronological record |
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| (noun) reports of the work of a society or learned body etc | - |
| annealing | (noun) hardening something by heat treatment | Synonyms: tempering |
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| annelid | (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
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| annihilation | (noun) destruction by annihilating something | Synonyms: obliteration |
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| (noun) total destruction | Synonyms: disintegration |
| annihilator | (noun) a total destroyer | - |
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| annual | (noun) a reference book that is published regularly once every year | Synonyms: yearbook, yearly |
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| (noun) (botany) a plant that completes its entire life cycle within the space of a year | - |
| annualry | (noun) the third finger (especially of the left hand) | Synonyms: ring finger |
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| annulet | (noun) molding in the form of a ring; at top of a column | Synonyms: bandelet, bandelette, bandlet, square and rabbet |
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| (noun) (heraldry) a charge in the shape of a small ring | - |
| annulment | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: invalidation |
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| (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, repeal |
| (noun) the state of being cancelled or annulled | Synonyms: revocation |
| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| anole | (noun) small arboreal tropical American insectivorous lizards with the ability to change skin color | Synonyms: American chameleon, Anolis carolinensis |
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| anomalist | (noun) someone who has a special interest in exceptional cases | - |
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| anomalops | (noun) fish having a luminous organ beneath eye; of warm waters of the western Pacific and Puerto Rico | Synonyms: flashlight fish |
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| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anomaly | (noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun) | - |
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| (noun) a person who is unusual | Synonyms: unusual person |
| (noun) deviation from the normal or common order or form or rule | Synonyms: anomalousness |
| anopheline | (noun) any mosquito of the genus Anopheles | - |
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| anovulant | (noun) a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception | Synonyms: anovulatory drug, birth control pill, contraceptive pill, oral contraceptive, oral contraceptive pill, pill |
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| anovulation | (noun) the absence of ovulation due to immaturity or post-maturity or pregnancy or oral contraceptive pills or dysfunction of the ovary | - |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| antediluvian | (noun) a very old person | Synonyms: ancient |
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| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| antelope | (noun) graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks | - |
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| antepenult | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenultima, antepenultimate |
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| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antepenultimate | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultima |
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| anthelminthic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
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| anthelmintic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
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| anthill | (noun) a mound of earth made by ants as they dig their nest | Synonyms: formicary |
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| anthologist | (noun) an editor who makes selections for an anthology | - |
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| anthology | (noun) a collection of selected literary passages | - |
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| anthophyllite | (noun) a dark brown mineral of the amphibole group; magnesium iron silicate | - |
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| anthropolatry | (noun) the worship of human beings | Synonyms: worship of man |
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| anthropologism | (noun) a point of view in which human nature is exhaustively determined by the culture in which a person lives, leaving no room for human agency. | - |
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| anthropologist | (noun) a social scientist who specializes in anthropology | - |
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| anthropology | (noun) the social science that studies the origins and social relationships of human beings | - |
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| antialiasing | (noun) (computer graphics) a technique that is used to smooth jagged distortions in curves and diagonal lines so they appear smoother | - |
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| antibacterial | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antifertilizin | (noun) An immunologically specific substance produced by animal sperm to implement attraction by the egg before fertilization. | - |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antifungal | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal agent, antimycotic, antimycotic agent, fungicide |
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| antilepton | (noun) the antiparticle of a lepton | - |
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