| aplomb | (noun) great coolness and composure under strain | Synonyms: assuredness, cool, poise, sang-froid |
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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| apologia | (noun) a formal written defense of something you believe in strongly | Synonyms: apology |
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| apologist | (noun) a person who argues to defend or justify some policy or institution | Synonyms: justifier, vindicator |
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| apologue | (noun) a short moral story (often with animal characters) | Synonyms: allegory, fable, parable |
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| apology | (noun) a poor example | Synonyms: excuse |
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| (noun) an expression of regret at having caused trouble for someone | - |
| (noun) a formal written defense of something you believe in strongly | Synonyms: apologia |
| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archaeology |
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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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| 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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| 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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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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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 |
| 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 |
| 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 | - |
| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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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 | - |
| 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 | - |
| 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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| 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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| 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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| 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 | (noun) a beloved person; used as terms of endearment | Synonyms: baby, darling, dear, dearest, dearie, deary, honey, love, sweetheart, sweetie |
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| bichloride | (noun) a compound containing two chlorine atoms per molecule | Synonyms: dichloride |
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| billow | (noun) a large sea wave | Synonyms: surge |
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| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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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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| 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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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| blob | (noun) an indistinct shapeless form | - |
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| 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 |
| 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 | - |
| 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) | - |
| 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 | - |
| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| blockhouse | (noun) a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire | - |
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| blocking | (noun) the act of obstructing or deflecting someone's movements | Synonyms: block |
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| blog | (noun) a shared on-line journal where people can post diary entries about their personal experiences and hobbies | Synonyms: web log |
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| blogger | (noun) a person who keeps and updates a blog | - |
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| bloke | (noun) a boy or man | Synonyms: blighter, chap, cuss, fella, feller, fellow, gent, lad |
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| blolly | (noun) evergreen climbing shrub of southern Florida and West Indies grown for its racemes of fragrant white to creamy flowers followed by globose white succulent berries | Synonyms: Chiococca alba, West Indian snowberry |
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| blond | (noun) a light grayish yellow to near white | Synonyms: blonde |
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| (noun) a male person with fair skin and hair | - |
| blonde | (noun) a light grayish yellow to near white | Synonyms: blond |
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| (noun) a female person with fair skin and hair | - |
| blondness | (noun) the property of having a naturally light complexion | Synonyms: fairness, paleness |
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| blood | (noun) temperament or disposition | - |
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| (noun) the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets | - |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| (noun) people viewed as members of a group | - |
| (noun) a dissolute man in fashionable society | Synonyms: profligate, rake, rakehell, rip, roue |
| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, Rivina humilis, rouge plant, rougeberry |
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| bloodguilt | (noun) the state of being guilty of bloodshed and murder | - |
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| bloodhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: sleuthhound |
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| bloodiness | (noun) a disposition to shed blood | Synonyms: bloodthirstiness |
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| (noun) the state of being bloody | - |
| bloodleaf | (noun) any plant of the genus Iresine having colored foliage | - |
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| bloodletting | (noun) formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine) | - |
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| (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodshed |
| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodlust | (noun) a desire for bloodshed | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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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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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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