| abbot | (noun) the superior of an abbey of monks | Synonyms: archimandrite |
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| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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| acaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: akaryocyte, akaryote |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| agiotage | (noun) a fee charged for exchanging currencies | Synonyms: agio, exchange premium, premium |
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| (noun) speculative dealing in stock exchange securities or foreign exchange. | - |
| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| aliquot | (noun) an integer that is an exact divisor of some quantity | Synonyms: aliquot part |
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| allotment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) a share set aside for a specific purpose | Synonyms: allocation |
| allotrope | (noun) a structurally different form of an element | - |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| alumroot | (noun) any of several herbs of the genus Heuchera | Synonyms: alumbloom |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amniote | (noun) any member of the Amniota | - |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| amyotrophia | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophy |
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| amyotrophy | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophia |
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| anatotitan | (noun) one of the largest and most famous duck-billed dinosaurs | - |
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| anecdotalism | (noun) The property of being related to short accounts of real incidents or persons, often humorous or interesting. | - |
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| anecdote | (noun) short account of an incident (especially a biographical one) | - |
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| anecdotist | (noun) a person skilled in telling anecdotes | Synonyms: raconteur |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| angiotensin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotonin, Hypertensin |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| annotating | (noun) the act of adding notes | Synonyms: annotation |
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| annotation | (noun) the act of adding notes | Synonyms: annotating |
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| (noun) a comment or instruction (usually added) | Synonyms: notation, note |
| annotator | (noun) a commentator who writes notes to a text | - |
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| antibiotic | (noun) a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections | Synonyms: antibiotic drug |
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| antidote | (noun) a remedy that stops or controls the effects of a poison | Synonyms: counterpoison |
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| antimycotic | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic agent, fungicide |
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| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| apothegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apophthegm |
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| apotheosis | (noun) the elevation of a person (as to the status of a god) | Synonyms: deification, exaltation |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: ideal, nonesuch, nonpareil, nonsuch, paragon, saint |
| apricot | (noun) a shade of pink tinged with yellow | Synonyms: peach, salmon pink, yellowish pink |
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| (noun) downy yellow to rosy-colored fruit resembling a small peach | - |
| (noun) Asian tree having clusters of usually white blossoms and edible fruit resembling the peach | Synonyms: apricot tree |
| arccotangent | (noun) the inverse function of the cotangent; the angle that has a cotangent equal to a given number | Synonyms: arc cotangent, inverse cotangent |
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| argot | (noun) a characteristic language of a particular group (as among thieves) | Synonyms: cant, jargon, lingo, patois, slang, vernacular |
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| arrowroot | (noun) white-flowered West Indian plant whose root yields arrowroot starch | Synonyms: American arrowroot, Maranta arundinaceae, obedience plant |
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| (noun) canna grown especially for its edible rootstock from which arrowroot starch is obtained | Synonyms: achira, Canna edulis, Canna indica, indian shot |
| (noun) a nutritive starch obtained from the root of the arrowroot plant | - |
| ascot | (noun) a cravat with wide square ends; secured with an ornamental pin | - |
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| asymptote | (noun) a straight line that is the limiting value of a curve; can be considered as tangent at infinity | - |
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| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| autoerotism | (noun) using your own body as a sexual object | Synonyms: autoeroticism |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| autotelism | (noun) belief that a work of art is an end in itself or its own justification | - |
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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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| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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| autotype | (noun) an exact copy or reproduction | Synonyms: facsimile |
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| (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotypy |
| autotypy | (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotype |
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| axolotl | (noun) larval salamander of mountain lakes of Mexico that usually lives without metamorphosing | Synonyms: Ambystoma mexicanum, mud puppy |
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| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| azote | (noun) an obsolete name for nitrogen | - |
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| azotemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, uraemia, uremia |
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| azoturia | (noun) excess of urea in the urine | - |
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| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| ballot | (noun) a choice that is made by counting the number of people in favor of each alternative | Synonyms: balloting, vote, voting |
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| (noun) a document listing the alternatives that is used in voting | - |
| balloting | (noun) a choice that is made by counting the number of people in favor of each alternative | Synonyms: ballot, vote, voting |
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| ballottement | (noun) a palpatory technique for feeling a floating object in the body (especially for determining the position of a fetus by feeling the rebound of the fetus after a quick digital tap on the wall of the uterus) | - |
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| balsamroot | (noun) a plant of the genus Balsamorhiza having downy leaves in a basal rosette and yellow flowers and long balsam-scented taproots | - |
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| bandicoot | (noun) any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous | - |
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| banknote | (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, bill, Federal Reserve note, government note, greenback, note |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| beetroot | (noun) round red root vegetable | Synonyms: beet |
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| (noun) beet having a massively swollen red root; widely grown for human consumption | Synonyms: Beta vulgaris rubra |
| behemoth | (noun) someone that is abnormally large and powerful | Synonyms: colossus, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: colossus, giant, heavyweight, titan |
| bergamot | (noun) small tree with pear-shaped fruit whose oil is used in perfumery; Italy | Synonyms: bergamot orange, Citrus bergamia |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (noun) the person to whom you are engaged | - |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| bibliotics | (noun) the scientific study of documents and handwriting etc. especially to determine authorship or authenticity | - |
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| bibliotist | (noun) someone who engages in bibliotics | - |
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| bigot | (noun) a prejudiced person who is intolerant of any opinions differing from his own | - |
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| bigotry | (noun) the intolerance and prejudice of a bigot | - |
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| biota | (noun) all the plant and animal life of a particular region | Synonyms: biology |
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| biotech | (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotechnology |
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| biotechnology | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, ergonomics |
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| (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotech |
| bioterrorism | (noun) terrorism using the weapons of biological warfare | Synonyms: biological terrorism |
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| biotin | (noun) a B vitamin that aids in body growth | Synonyms: vitamin H |
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| biotite | (noun) dark brown to black mica found in igneous and metamorphic rock | - |
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| biotype | (noun) organisms sharing a specified genotype or the genotype (or peculiarities) so shared | - |
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| birthroot | (noun) trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth | Synonyms: purple trillium, red trillium, Trillium erectum |
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| bitterroot | (noun) showy succulent ground-hugging plant of Rocky Mountains regions having deep to pale pink flowers and fleshy farinaceous roots; the Montana state flower | Synonyms: Lewisia rediviva |
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| bloodroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: puccoon, redroot, Sanguinaria canadensis, tetterwort |
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| blot | (noun) an act that brings discredit to the person who does it | Synonyms: smear, smirch, spot, stain |
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| (noun) a blemish made by dirt | Synonyms: daub, slur, smear, smirch, smudge, spot |
| blotch | (noun) an irregularly shaped spot | Synonyms: splodge, splotch |
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| blotter | (noun) the daily written record of events (as arrests) in a police station | Synonyms: charge sheet, day book, police blotter, rap sheet |
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| (noun) absorbent paper used to dry ink | Synonyms: blotting paper |
| bluebottle | (noun) blowfly with iridescent blue body; makes a loud buzzing noise in flight | Synonyms: Calliphora vicina |
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| (noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers | Synonyms: bachelor's button, Centaurea cyanus, cornflower |