| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| atom | (noun) (physics and chemistry) the smallest component of an element having the chemical properties of the element | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: corpuscle, molecule, mote, particle, speck |
| atomic | (adjective) (weapons) deriving destructive energy from the release of atomic energy | Synonyms: nuclear |
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| (adjective) of or relating to or comprising atoms | - |
| (adjective) immeasurably small | - |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| atomise | (verb) break up into small particles | Synonyms: atomize |
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| (verb) strike at with firepower or bombs | Synonyms: atomize, nuke, zap |
| (verb) spray very finely | Synonyms: atomize |
| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| atomism | (noun) (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles | Synonyms: atomic theory, atomist theory, atomistic theory |
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| (noun) (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association | - |
| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atomization | (noun) separating something into fine particles | Synonyms: atomisation, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomisation |
| atomize | (verb) break up into small particles | Synonyms: atomise |
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| (verb) strike at with firepower or bombs | Synonyms: atomise, nuke, zap |
| (verb) spray very finely | Synonyms: atomise |
| atomizer | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomiser, nebuliser, nebulizer, spray, sprayer |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| automat | (noun) a cafeteria where food is served from machines | - |
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| (noun) a vending machine from which you can get food | - |
| automate | (verb) make automatic or control or operate automatically | Synonyms: automatise, automatize |
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| automated | (adjective) operated by automation | Synonyms: machine-controlled, machine-driven |
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| automatic | (adjective) operating with minimal human intervention; independent of external control | - |
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| (adjective) without volition or conscious control | Synonyms: reflex, reflexive |
| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatonlike, machinelike, robotic, robotlike |
| (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |
| automatically | (adverb) in a reflex manner | - |
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| (adverb) in a mechanical manner; by a mechanism | Synonyms: mechanically |
| automation | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: mechanisation, mechanization |
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| (noun) equipment used to achieve automatic control or operation | - |
| (noun) the condition of being automatically operated or controlled | - |
| automatise | (verb) make automatic or control or operate automatically | Synonyms: automate, automatize |
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| (verb) turn into an automaton | Synonyms: automatize |
| automatism | (noun) any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy) | - |
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| automatize | (verb) make automatic or control or operate automatically | Synonyms: automate, automatise |
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| (verb) turn into an automaton | Synonyms: automatise |
| automaton | (noun) a mechanism that can move automatically | Synonyms: golem, robot |
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| (noun) a machine that operates on its own without the need for human control | - |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: zombi, zombie |
| automatonlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, machinelike, robotic, robotlike |
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| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| (verb) travel in an automobile | - |
| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| automotive | (adjective) of or relating to motor vehicles | - |
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| (adjective) containing within itself the means of propulsion or movement | Synonyms: self-propelled, self-propelling |
| automysophobia | (noun) a morbid fear of being dirty | - |
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| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| autonomy | (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: liberty |
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| (noun) personal independence | Synonyms: self-direction, self-reliance, self-sufficiency |
| autosomal | (adjective) of or relating to an autosome | - |
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| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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| autotomic | (adjective) of or relating to autotomy | - |
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| autotomise | (verb) cause a body part to undergo autotomy | Synonyms: autotomize |
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| autotomize | (verb) cause a body part to undergo autotomy | Synonyms: autotomise |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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| awesome | (adjective) inspiring awe or admiration or wonder | Synonyms: amazing, awe-inspiring, awful, awing |
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| axiom | (noun) a saying that is widely accepted on its own merits | Synonyms: maxim |
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| (noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident | - |
| axiomatic | (adjective) of or relating to or derived from axioms | Synonyms: axiomatical, postulational |
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| (adjective) containing aphorisms or maxims | Synonyms: aphoristic |
| (adjective) evident without proof or argument | Synonyms: self-evident, taken for granted |
| axiomatical | (adjective) of or relating to or derived from axioms | Synonyms: axiomatic, postulational |
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| axiomatically | (adverb) on the basis of axioms | - |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| backroom | (noun) the meeting place of a group of leaders who make their decisions via private negotiations | - |
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| balletomane | (noun) a ballet enthusiast | - |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| ballroom | (noun) large room used mainly for dancing | Synonyms: dance hall, dance palace |
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| barometer | (noun) an instrument that measures atmospheric pressure | - |
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| barometric | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometrical |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| barroom | (noun) a room or establishment where alcoholic drinks are served over a counter | Synonyms: bar, ginmill, saloon, taproom |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| bathometer | (noun) an instrument that measures the depth of water | Synonyms: bathymeter |
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| bathroom | (noun) a room (as in a residence) containing a bathtub or shower and usually a washbasin and toilet | - |
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| (noun) a room or building equipped with one or more toilets | Synonyms: can, john, lav, lavatory, privy, toilet |
| batrachomyomachia | (noun) a silly altercation | - |
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| beachcomber | (noun) a vagrant living on a beach | - |
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| become | (verb) enter or assume a certain state or condition | Synonyms: get, go |
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| (verb) come into existence | - |
| (verb) undergo a change or development | Synonyms: turn |
| (verb) enhance the appearance of | Synonyms: suit |
| becoming | (adjective) displaying or setting off to best advantage | - |
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| (adjective) according with custom or propriety | Synonyms: comely, comme il faut, decorous, seemly |
| becomingly | (adverb) in a becoming manner | - |
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| becomingness | (noun) the quality of being becoming | - |
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| bedroom | (noun) a room used primarily for sleeping | Synonyms: bedchamber, chamber, sleeping accommodation, sleeping room |
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| beggarwoman | (noun) a woman who is a beggar | - |
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| bellbottom | (adjective) (of trousers) having legs that flare at the bottom | Synonyms: bell-bottom, bell-bottomed |
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| besom | (noun) a broom made of twigs tied together on a long handle | - |
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| bibliomania | (noun) preoccupation with the acquisition and possession of books | - |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bichromate | (noun) a salt of the hypothetical dichromic acid | Synonyms: dichromate |
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| bichromated | (adjective) treated or combined with bichromate | - |
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| bichrome | (adjective) having two colors | Synonyms: bicolor, bicolored, bicolour, bicoloured, dichromatic |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| (noun) (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms | - |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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| biomass | (noun) the total mass of living matter in a given unit area | - |
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| (noun) plant materials and animal waste used as fuel | - |
| biome | (noun) a major biotic community characterized by the dominant forms of plant life and the prevailing climate | - |
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| biomedical | (adjective) relating to the activities and applications of science to clinical medicine | - |
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| biomedicine | (noun) the branch of medical science that studies the ability of organisms to withstand environmental stress (as in space travel) | - |
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| (noun) the branch of medical science that applies biological and physiological principles to clinical practice | - |
| biometrics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometry, biostatistics |
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| biometry | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biostatistics |
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| bionomic | (adjective) of or relating to the science of ecology | Synonyms: bionomical, ecologic, ecological |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| bionomics | (noun) the branch of biology concerned with the relations between organisms and their environment | Synonyms: ecology, environmental science |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| blastoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastocytoma, embryonal carcinosarcoma |
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| blastomere | (noun) any cell resulting from cleavage of a fertilized egg | - |
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| blastomeric | (adjective) of or relating to a blastomere | - |
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| blastomycete | (noun) any of various yeastlike budding fungi of the genus Blastomyces; cause disease in humans and other animals | - |
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| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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| blastomycotic | (adjective) of or relating to or characteristic of blastomycosis | - |
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| blithesome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, light-hearted, lighthearted, lightsome |
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| bloom | (noun) a powdery deposit on a surface | Synonyms: efflorescence |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: blossom, flower |
| (noun) the organic process of bearing flowers | Synonyms: blooming |
| (noun) a rosy color (especially in the cheeks) taken as a sign of good health | Synonyms: blush, flush, rosiness |
| (noun) the best time of youth | Synonyms: bloom of youth, salad days |
| (noun) the period of greatest prosperity or productivity | Synonyms: blossom, efflorescence, flower, flush, heyday, peak, prime |
| (verb) produce or yield flowers | Synonyms: blossom, flower |
| bloomer | (noun) an embarrassing mistake | Synonyms: blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (noun) a flower that blooms in a particular way | - |
| bloomers | (noun) (used in the plural) underpants worn by women | Synonyms: drawers, knickers, pants |
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| blooming | (adjective) informal intensifiers | Synonyms: bally, blinking, bloody, crashing, flaming, fucking |
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| (noun) the organic process of bearing flowers | Synonyms: bloom |