| abhenry | (noun) a unit of inductance equal to one billionth of a henry | - |
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| acanthopterygian | (noun) a teleost fish with fins that are supported by sharp inflexible rays | Synonyms: spiny-finned fish |
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| acaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: akaryocyte, akaryote |
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| accessary | (noun) someone who helps another person commit a crime | Synonyms: accessory |
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| accessory | (noun) a supplementary component that improves capability | Synonyms: add-on, appurtenance, supplement |
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| (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accouterment, accoutrement |
| (noun) someone who helps another person commit a crime | Synonyms: accessary |
| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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| acrylamide | (noun) a white crystalline amide of propenoic acid can damage the nervous system and is carcinogenic in laboratory animals | - |
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| acrylate | (noun) a salt or ester of propenoic acid | Synonyms: propenoate |
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| acrylic | (noun) a synthetic fabric made from polyacrylonitrile | - |
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| (noun) used especially by artists | Synonyms: acrylic paint |
| (noun) a glassy thermoplastic; can be cast and molded or used in coatings and adhesives | Synonyms: acrylate resin, acrylic resin |
| (noun) polymerized from acrylonitrile | Synonyms: acrylic fiber |
| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| adultery | (noun) extramarital sex that willfully and maliciously interferes with marriage relations | Synonyms: criminal conversation, fornication |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| advisory | (noun) an announcement that usually advises or warns the public of some threat | - |
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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| allegory | (noun) a short moral story (often with animal characters) | Synonyms: apologue, fable, parable |
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| (noun) an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor | - |
| (noun) a visible symbol representing an abstract idea | Synonyms: emblem |
| allometry | (noun) the study of the relative growth of a part of an organism in relation to the growth of the whole | - |
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| allopatry | (noun) the occurrence of related organisms in separate geographical areas with no overlap | - |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| ancestry | (noun) inherited properties shared with others of your bloodline | Synonyms: derivation, filiation, lineage |
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| (noun) the hereditary derivation of an individual | Synonyms: blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| andryala | (noun) any plant of the genus Andryala having milky sap and heads of bright yellow flowers | - |
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| anemometry | (noun) measuring wind speed and direction | - |
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| aneurysm | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurism |
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| anniversary | (noun) the date on which an event occurred in some previous year (or the celebration of it) | Synonyms: day of remembrance |
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| annualry | (noun) the third finger (especially of the left hand) | Synonyms: ring finger |
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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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| anthropolatry | (noun) the worship of human beings | Synonyms: worship of man |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| antibaryon | (noun) the antiparticle of a baryon; a hadron with a baryon number of -1 | - |
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| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| apery | (noun) the act of mimicking; imitative behavior | Synonyms: mimicry |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| 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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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| archery | (noun) the sport of shooting arrows with a bow | - |
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| armory | (noun) a place where arms are manufactured | Synonyms: armoury, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armoury, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armoury, arsenal |
| (noun) a collection of resources | Synonyms: armoury, inventory |
| armoury | (noun) a place where arms are manufactured | Synonyms: armory, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, arsenal |
| (noun) a collection of resources | Synonyms: armory, inventory |
| artery | (noun) a major thoroughfare that bears important traffic | - |
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| (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arteria, arterial blood vessel |
| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| artistry | (noun) a superior skill that you can learn by study and practice and observation | Synonyms: art, prowess |
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| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| arytenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytaenoid, arytenoid cartilage |
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| astrolatry | (noun) the worship of planets or stars | Synonyms: worship of heavenly bodies |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| asymmetry | (noun) (mathematics) a lack of symmetry | - |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| auxiliary | (noun) someone who acts as assistant | Synonyms: aide |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| bakery | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakeshop |
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| banditry | (noun) the practice of plundering in gangs | - |
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| baneberry | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: cohosh, herb Christopher |
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| (noun) a poisonous berry of a plant of the genus Actaea | - |
| baptistery | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistry, font |
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| baptistry | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistery, font |
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| barberry | (noun) any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries | - |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| barratry | (noun) the offense of vexatiously persisting in inciting lawsuits and quarrels | - |
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| (noun) (maritime law) a fraudulent breach of duty by the master of a ship that injures the owner of the ship or its cargo; includes every breach of trust such as stealing or sinking or deserting the ship or embezzling the cargo | - |
| (noun) the crime of a judge whose judgment is influenced by bribery | - |
| (noun) traffic in ecclesiastical offices or preferments | Synonyms: simony |
| barycenter | (noun) (astronomy) the common center of mass around which two or more bodies revolve | - |
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| barye | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, microbar |
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| baryon | (noun) any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 | Synonyms: heavy particle |
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| baryta | (noun) any of several compounds of barium | - |
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| barytes | (noun) a white or colorless mineral (BaSO4); the main source of barium | Synonyms: barite, barium sulphate, heavy spar |
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| barytone | (noun) a male singer | Synonyms: baritone |
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| basketry | (noun) the craft of basket making | - |
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| bathymetry | (noun) measuring the depths of the oceans | Synonyms: plumbing |
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| battery | (noun) an assault in which the assailant makes physical contact | Synonyms: assault and battery |
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| (noun) the heavy fire of artillery to saturate an area rather than hit a specific target | Synonyms: barrage, barrage fire, bombardment, shelling |
| (noun) a device that produces electricity; may have several primary or secondary cells arranged in parallel or series | Synonyms: electric battery |
| (noun) a series of stamps operated in one mortar for crushing ores | Synonyms: stamp battery |
| (noun) a collection of related things intended for use together | - |
| (noun) group of guns or missile launchers operated together at one place | - |
| (noun) a unit composed of the pitcher and catcher | - |
| bawdry | (noun) lewd or obscene talk or writing | Synonyms: bawdy |
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| bayberry | (noun) West Indian tree; source of bay rum | Synonyms: bay-rum tree, Jamaica bayberry, Pimenta acris, wild cinnamon |
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| (noun) deciduous aromatic shrub of eastern North America with grey-green wax-coated berries | Synonyms: candleberry, Myrica pensylvanica, swamp candleberry, waxberry |
| bearberry | (noun) chiefly evergreen subshrubs of northern to Arctic areas | - |
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| (noun) deciduous shrub of southeastern and central United States | Synonyms: Ilex decidua, possum haw, winterberry |
| (noun) shrubby tree of the Pacific coast of the United States; yields cascara sagrada | Synonyms: bearwood, cascara buckthorn, chittamwood, chittimwood, Rhamnus purshianus |
| beaugregory | (noun) a blue and yellow damselfish of Bermuda and Florida and the West Indies | Synonyms: Pomacentrus leucostictus |
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| beggary | (noun) a solicitation for money or food (especially in the street by an apparently penniless person) | Synonyms: begging, mendicancy |
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| (noun) the state of being a beggar or mendicant | Synonyms: mendicancy, mendicity |
| belfry | (noun) a room (often at the top of a tower) where bells are hung | - |
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| (noun) a bell tower; usually stands alone unattached to a building | Synonyms: campanile |
| beneficiary | (noun) the semantic role of the intended recipient who benefits from the happening denoted by the verb in the clause | Synonyms: benefactive role |
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| (noun) the recipient of funds or other benefits | Synonyms: donee |
| berry | (noun) any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves | - |
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| (noun) a small fruit having any of various structures, e.g., simple (grape or blueberry) or aggregate (blackberry or raspberry) | - |
| beryl | (noun) the chief source of beryllium; colored transparent varieties are valued as gems | - |
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| beryllium | (noun) a light strong brittle grey toxic bivalent metallic element | Synonyms: atomic number 4, Be, glucinium |
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| bestiary | (noun) a medieval book (usually illustrated) with allegorical and amusing descriptions of real and fabled animals | - |
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| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bicentenary | (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentennial |
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| bigotry | (noun) the intolerance and prejudice of a bigot | - |
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| bilberry | (noun) blue-black berries similar to American blueberries | Synonyms: European blueberry, whortleberry |
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| (noun) erect blueberry of western United States having solitary flowers and somewhat sour berries | Synonyms: mountain blue berry, thin-leaved bilberry, Viccinium membranaceum |
| (noun) erect European blueberry having solitary flowers and blue-black berries | Synonyms: blaeberry, Viccinium myrtillus, whinberry, whortleberry |
| bimillenary | (noun) a span of 2000 years | Synonyms: bimillennium |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillennium |
| binary | (noun) a pre-compiled, pre-linked program that is ready to run under a given operating system; a binary for one operating system will not run on a different operating system | Synonyms: binary program |
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| (noun) a system of two stars that revolve around each other under their mutual gravitation | Synonyms: binary star, double star |