| arenicolous | (adjective) growing or living or burrowing in sand | - |
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| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| aslope | (adjective) having an oblique or slanted direction | Synonyms: aslant, diagonal, slanted, slanting, sloped, sloping |
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| aspergillosis | (noun) an opportunistic infection by a fungus of the genus Aspergillus; characterized by inflammation and lesions of the ear and other organs | - |
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| (noun) disease especially in agricultural workers caused by inhalation of Aspergillus spores causing lumps in skin and ears and respiratory organs | - |
| (noun) severe respiratory disease of birds that takes the form of an acute rapidly fatal pneumonia in young chickens and turkeys | Synonyms: brooder pneumonia |
| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| atenolol | (noun) an oral beta blocker (trade name Tenormin) used in treating hypertension and angina; has adverse side effects (depression and exacerbation of congestive heart failure etc.) | Synonyms: Tenormin |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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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 |
| axiological | (adjective) of or relating to the study of values | - |
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| axiology | (noun) the study of values and value judgments | - |
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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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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| (verb) lead a bachelor's existence | Synonyms: bach |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| backflow | (noun) a flow that returns toward its source | Synonyms: backflowing |
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| backflowing | (noun) a flow that returns toward its source | Synonyms: backflow |
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| backlog | (noun) an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services) | - |
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| (noun) something kept back or saved for future use or a special purpose | Synonyms: reserve, stockpile |
| (noun) the large log at the back of a hearth fire | - |
| (verb) accumulate and create a backlog | - |
| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bailor | (noun) the person who delivers personal property (goods or money) in trust to the bailee in a bailment | - |
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| ballock | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, bollock, egg, nut, orchis, testicle, testis |
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| balloon | (noun) large tough nonrigid bag filled with gas or heated air | - |
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| (noun) small thin inflatable rubber bag with narrow neck | - |
| (verb) become inflated | Synonyms: billow, inflate |
| (verb) ride in a hot-air balloon | - |
| balloonfish | (noun) similar to but smaller than porcupinefish | Synonyms: Diodon holocanthus |
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| ballooning | (noun) flying in a balloon | - |
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| balloonist | (noun) someone who flies a balloon | - |
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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 | - |
| (verb) vote by ballot | - |
| 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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| baloney | (noun) pretentious or silly talk or writing | Synonyms: bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bargello | (noun) needlepoint embroidery stitch that produces zigzag lines | Synonyms: flame stitch |
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| becloud | (verb) make less visible or unclear | Synonyms: befog, cloud, fog, haze over, mist, obnubilate, obscure |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| bedfellow | (noun) a person with whom you share a bed | Synonyms: bedmate |
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| (noun) a temporary associate | - |
| beefalo | (noun) hardy breed of cattle resulting from crossing domestic cattle with the American buffalo; yields leaner beef than conventional breeds | Synonyms: cattalo |
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| bellflower | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: campanula |
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| bellow | (noun) a very loud utterance (like the sound of an animal) | Synonyms: bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl |
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| (verb) shout loudly and without restraint | Synonyms: bawl |
| (verb) make a loud noise, as of animal | Synonyms: roar |
| bellower | (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, roarer, screamer, screecher, shouter, yeller |
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| bellowing | (noun) a very loud utterance (like the sound of an animal) | Synonyms: bellow, holla, holler, hollering, hollo, holloa, roar, roaring, yowl |
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| bellows | (noun) (used in the plural) a mechanical device that blows a strong current of air; used to make a fire burn more fiercely or to sound a musical instrument | - |
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| belong | (verb) be owned by; be in the possession of | - |
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| (verb) be rightly classified in a class or category | - |
| (verb) be suitable or acceptable | - |
| (verb) be in the right place or situation | Synonyms: go |
| (verb) be a part or adjunct | Synonyms: belong to |
| (verb) be a member, adherent, inhabitant, etc. (of a group, organization, or place) | - |
| belonging | (noun) happiness felt in a secure relationship | - |
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| belongings | (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: holding, property |
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| beloved | (adjective) dearly loved | Synonyms: darling, dear |
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| (noun) a beloved person; used as terms of endearment | Synonyms: baby, darling, dear, dearest, dearie, deary, honey, love, sweetheart, sweetie |
| below | (adverb) (in writing) at a later place | Synonyms: infra |
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| (adverb) in or to a place that is lower | Synonyms: at a lower place, beneath, to a lower place |
| (adverb) further down | Synonyms: under |
| (adverb) on a floor below | Synonyms: down the stairs, downstairs, on a lower floor |
| belowground | (adjective) underneath the ground | - |
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| (adjective) under the level of the ground | Synonyms: underground |
| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| bicephalous | (adjective) having two heads | - |
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| bichloride | (noun) a compound containing two chlorine atoms per molecule | Synonyms: dichloride |
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| bicolor | (adjective) having two colors | Synonyms: bichrome, bicolored, bicolour, bicoloured, dichromatic |
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| bicolored | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolour, bicoloured, dichromatic |
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| bicolour | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicoloured, dichromatic |
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| bicoloured | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicolour, dichromatic |
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| billow | (noun) a large sea wave | Synonyms: surge |
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| (verb) become inflated | Synonyms: balloon, inflate |
| (verb) rise and move, as in waves or billows | Synonyms: heave, surge |
| (verb) rise up as if in waves | Synonyms: wallow |
| (verb) move with great difficulty | - |
| billowing | (adjective) characterized by great swelling waves or surges | Synonyms: billowy, surging |
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| billowy | (adjective) characterized by great swelling waves or surges | Synonyms: billowing, surging |
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| bilobate | (adjective) divided into two lobes | Synonyms: bilobated, bilobed |
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| bilobated | (adjective) divided into two lobes | Synonyms: bilobate, bilobed |
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| bilobed | (adjective) divided into two lobes | Synonyms: bilobate, bilobated |
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| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| bilocular | (adjective) divided into or containing two cells or chambers | Synonyms: biloculate |
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| biloculate | (adjective) divided into or containing two cells or chambers | Synonyms: bilocular |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| biologic | (adjective) pertaining to biology or to life and living things | Synonyms: biological |
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| biological | (adjective) (of a parent or child) related by blood; genetically related | Synonyms: natural |
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| (adjective) pertaining to biology or to life and living things | Synonyms: biologic |
| biologically | (adverb) with respect to biology | - |
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| biologism | (noun) use of biological principles in explaining human especially social behavior | - |
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| biologist | (noun) (biology) a scientist who studies living organisms | Synonyms: life scientist |
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| biologistic | (adjective) of or relating to biologism | - |
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| biology | (noun) the science that studies living organisms | Synonyms: biological science |
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| (noun) all the plant and animal life of a particular region | Synonyms: biota |
| (noun) characteristic life processes and phenomena of living organisms | - |
| 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 |
| blanquillo | (noun) important marine food fishes | Synonyms: tilefish |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| bloat | (noun) swelling of the rumen or intestinal tract of domestic animals caused by excessive gas | - |
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| (verb) become bloated or swollen or puff up | - |
| (verb) make bloated or swollen | - |
| bloated | (adjective) abnormally distended especially by fluids or gas | Synonyms: distended, intumescent, puffy, swollen, tumescent, tumid, turgid |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| blob | (noun) an indistinct shapeless form | - |
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| (verb) make a spot or mark onto | Synonyms: blot, fleck, spot |
| bloc | (noun) a group of countries in special alliance | Synonyms: axis |
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| block | (noun) the act of obstructing or deflecting someone's movements | Synonyms: blocking |
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| (noun) a solid piece of something (usually having flat rectangular sides) | - |
| (noun) an obstruction in a pipe or tube | Synonyms: blockage, closure, occlusion, stop, stoppage |
| (noun) a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope | Synonyms: pulley-block, pulley, pulley block |
| (noun) a metal casting containing the cylinders and cooling ducts of an engine | Synonyms: cylinder block, engine block |
| (noun) a platform from which an auctioneer sells | Synonyms: auction block |
| (noun) housing in a large building that is divided into separate units | - |
| (noun) an inability to remember or think of something you normally can do; often caused by emotional tension | Synonyms: mental block |
| (noun) a number or quantity of related things dealt with as a unit | - |
| (noun) a rectangular area in a city surrounded by streets and usually containing several buildings | Synonyms: city block |
| (noun) (computer science) a sector or group of sectors that function as the smallest data unit permitted | - |
| (noun) a three-dimensional shape with six square or rectangular sides | Synonyms: cube |
| (verb) shape into a block or blocks | - |
| (verb) shape by using a block | - |
| (verb) prohibit the conversion or use of (assets) | Synonyms: freeze, immobilise, immobilize |
| (verb) be unable to remember | Synonyms: blank out, draw a blank, forget |
| (verb) interfere with or prevent the reception of signals | Synonyms: jam |
| (verb) impede the movement of (an opponent or a ball) | Synonyms: deflect, parry |
| (verb) render unsuitable for passage | Synonyms: bar, barricade, block off, block up, blockade, stop |
| (verb) obstruct | Synonyms: choke up, lug, stuff |
| (verb) stamp or emboss a title or design on a book with a block | - |
| (verb) support, secure, or raise with a block | - |
| (verb) block passage through | Synonyms: close up, impede, jam, obstruct, obturate, occlude |
| (verb) shut out from view or get in the way so as to hide from sight | Synonyms: obstruct |
| (verb) interrupt the normal function of by means of anesthesia | - |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: blockade, embarrass, hinder, obstruct, stymie, stymy |
| (verb) stop from happening or developing | Synonyms: halt, kibosh, stop |
| (verb) run on a block system | - |
| blockade | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: encirclement |
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| (noun) prevents access or progress | - |
| (verb) impose a blockade on | Synonyms: seal off |
| (verb) obstruct access to | Synonyms: block off |
| (verb) render unsuitable for passage | Synonyms: bar, barricade, block, block off, block up, stop |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: block, embarrass, hinder, obstruct, stymie, stymy |
| blockaded | (adjective) preventing entry or exit or a course of action | Synonyms: barred, barricaded |
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| blockading | (adjective) blocking entrance to and exit from seaports and harbors | - |
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| blockage | (noun) the act of blocking | Synonyms: closure, occlusion |
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| (noun) an obstruction in a pipe or tube | Synonyms: block, closure, occlusion, stop, stoppage |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: obstruction |
| blockbuster | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: megahit, smash hit |
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| (noun) a large bomb used to demolish extensive areas (as a city block) | - |
| blocked | (adjective) closed to traffic | - |
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| (adjective) completely obstructed or closed off | Synonyms: plugged |
| blocker | (noun) a class of drugs that inhibit (block) some biological process | Synonyms: blocking agent |
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| (noun) a football player whose responsibility is to block players attempting to stop an offensive play | - |