| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| benthos | (noun) organisms (plants and animals) that live at or near the bottom of a sea, lake, river or stream | - |
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| (noun) a region including the bottom of the sea and the littoral zones | Synonyms: benthic division, benthonic zone |
| berth | (noun) a job in an organization | Synonyms: office, place, position, post, situation |
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| (noun) a bed on a ship or train; usually in tiers | Synonyms: built in bed, bunk |
| (noun) a place where a craft can be made fast | Synonyms: moorage, mooring, slip |
| beth | (noun) the 2nd letter of the Hebrew alphabet | - |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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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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| billionth | (noun) one part in a billion equal parts | Synonyms: one-billionth |
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| (noun) position 1,000,000,000 in a countable series of things | - |
| bimonthly | (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
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| bioethics | (noun) the branch of ethics that studies moral values in the biomedical sciences | - |
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| biosynthesis | (noun) production of a chemical compound by a living organism | Synonyms: biogenesis |
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| birdbath | (noun) an ornamental basin (usually in a garden) for birds to bathe in | - |
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| birth | (noun) the event of being born | Synonyms: nascence, nascency, nativity |
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| (noun) a baby born; an offspring | - |
| (noun) the process of giving birth | Synonyms: birthing, giving birth, parturition |
| (noun) the kinship relation of an offspring to the parents | Synonyms: parentage |
| (noun) the time when something begins (especially life) | - |
| birthday | (noun) an anniversary of the day on which a person was born (or the celebration of it) | - |
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| (noun) the date on which a person was born | Synonyms: natal day |
| birthing | (noun) the process of giving birth | Synonyms: birth, giving birth, parturition |
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| birthmark | (noun) a blemish on the skin that is formed before birth | Synonyms: nevus |
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| birthplace | (noun) the place where someone was born | Synonyms: place of birth |
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| (noun) where something originated or was nurtured in its early existence | Synonyms: cradle, place of origin, provenance, provenience |
| birthrate | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, fertility, fertility rate, natality |
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| birthright | (noun) a right or privilege that you are entitled to at birth | - |
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| (noun) an inheritance coming by right of birth (especially by primogeniture) | Synonyms: patrimony |
| 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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| birthwort | (noun) creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America | Synonyms: Aristolochia clematitis |
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| bismuth | (noun) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals | Synonyms: atomic number 83, Bi |
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| bitthead | (noun) the upper end of a bitt | - |
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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| blameworthiness | (noun) a state of guilt | Synonyms: culpability, culpableness |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| blitheness | (noun) a feeling of spontaneous good spirits | Synonyms: cheerfulness |
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| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bluethroat | (noun) songbird of northern Europe and Asia | Synonyms: Erithacus svecicus |
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| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| bonnethead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, shovelhead, Sphyrna tiburo |
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| bookcloth | (noun) a woven fabric (usually cotton) used for book covers. | Synonyms: book cloth |
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| booth | (noun) small area set off by walls for special use | Synonyms: cubicle, kiosk, stall |
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| (noun) a small shop at a fair; for selling goods or entertainment | - |
| (noun) a table (in a restaurant or bar) surrounded by two high-backed benches | - |
| boothose | (noun) protective stockings worn with or in place of boots | - |
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| bother | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) an angry disturbance | Synonyms: fuss, hassle, trouble |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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| breadth | (noun) the extent of something from side to side | Synonyms: width |
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| (noun) the capacity to understand a broad range of topics | Synonyms: comprehensiveness, largeness |
| breakthrough | (noun) a penetration of a barrier such as an enemy's defense | - |
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| (noun) making an important discovery | - |
| (noun) a productive insight | Synonyms: discovery, find |
| breath | (noun) the process of taking in and expelling air during breathing | - |
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| (noun) an indirect suggestion | Synonyms: hint, intimation |
| (noun) a slight movement of the air | - |
| (noun) the air that is inhaled and exhaled in respiration | - |
| (noun) a short respite | Synonyms: breather, breathing place, breathing space, breathing spell, breathing time |
| breathalyser | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyzer |
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| breathalyzer | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyser |
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| breather | (noun) air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time | Synonyms: schnorchel, schnorkel, snorkel, snorkel breather |
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| (noun) a short respite | Synonyms: breath, breathing place, breathing space, breathing spell, breathing time |
| breathing | (noun) the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation | Synonyms: external respiration, respiration, ventilation |
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| breathlessness | (noun) a dyspneic condition | Synonyms: shortness of breath, SOB |
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| breechcloth | (noun) a garment that provides covering for the loins | Synonyms: breechclout, loincloth |
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| brethren | (noun) (plural) the lay members of a male religious order | - |
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| broadcloth | (noun) a closely woven silk or synthetic fabric with a narrow crosswise rib | - |
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| (noun) a densely textured woolen fabric with a lustrous finish | - |
| broth | (noun) a thin soup of meat or fish or vegetable stock | - |
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| (noun) liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces | Synonyms: stock |
| brothel | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| brother | (noun) a male with the same parents as someone else | Synonyms: blood brother |
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| (noun) a male person who is a fellow member (of a fraternity or religion or other group) | - |
| (noun) a close friend who accompanies his buddies in their activities | Synonyms: buddy, chum, crony, pal, sidekick |
| (noun) used as a term of address for those male persons engaged in the same movement | Synonyms: comrade |
| brotherhood | (noun) the feeling that men should treat one another like brothers | - |
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| (noun) people engaged in a particular occupation | Synonyms: fraternity, sodality |
| (noun) an organization of employees formed to bargain with the employer | Synonyms: labor union, trade union, trades union, union |
| (noun) the kinship relation between a male offspring and the siblings | - |
| bryanthus | (noun) procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers | - |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |
| bucktooth | (noun) a large projecting front tooth | - |
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| bullethead | (noun) a head shaped like a bullet | - |
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| burthen | (noun) a variant of `burden' | - |
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| bypath | (noun) a side road little traveled (as in the countryside) | Synonyms: byroad, byway |
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| cacoethes | (noun) an irrational but irresistible motive for a belief or action | Synonyms: mania, passion |
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| calanthe | (noun) any of various showy orchids of the genus Calanthe having white or yellow or rose-colored flowers and broad leaves folded lengthwise | - |
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| calisthenics | (noun) the practice of calisthenic exercises | Synonyms: callisthenics |
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| (noun) light exercises designed to promote general fitness | Synonyms: callisthenics |
| callathump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callithump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callithump, callithump parade |
| callisthenics | (noun) the practice of calisthenic exercises | Synonyms: calisthenics |
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| (noun) light exercises designed to promote general fitness | Synonyms: calisthenics |
| callithump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callathump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callathump, callithump parade |
| canthus | (noun) either of the corners of the eye where the upper and lower eyelids meet | - |
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| cardiomyopathy | (noun) a disorder (usually of unknown origin) of the heart muscle (myocardium) | Synonyms: myocardiopathy |
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| cardiopathy | (noun) a disease of the heart | Synonyms: heart disease |
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| carthorse | (noun) draft horse kept for pulling carts | Synonyms: cart horse, drayhorse |
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| catathymia | (noun) A state in which mental processes are under the control of the emotions. | - |
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| catharsis | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: abreaction, katharsis |
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| (noun) purging the body by the use of a cathartic to stimulate evacuation of the bowels | Synonyms: katharsis, purgation |
| cathartic | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: aperient, physic, purgative |
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| cathartid | (noun) large birds of prey superficially similar to Old World vultures | Synonyms: New World vulture |
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| cathedra | (noun) a throne that is the official chair of a bishop | Synonyms: bishop's throne |
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| cathedral | (noun) any large and important church | - |
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| (noun) the principal Christian church building of a bishop's diocese | Synonyms: duomo |
| catheter | (noun) a thin flexible tube inserted into the body to permit introduction or withdrawal of fluids or to keep the passageway open | - |
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| catheterisation | (noun) the operation of introducing a catheter into the body | Synonyms: catheterization |
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| catheterization | (noun) the operation of introducing a catheter into the body | Synonyms: catheterisation |
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| cathexis | (noun) (psychoanalysis) the libidinal energy invested in some idea or person or object | Synonyms: charge |
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| cathode | (noun) a negatively charged electrode that is the source of electrons entering an electrical device | - |
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| (noun) the positively charged terminal of a voltaic cell or storage battery that supplies current | - |
| catholicity | (noun) the quality of being universal; existing everywhere | Synonyms: universality |
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| catholicon | (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: cure-all, nostrum, panacea |
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| cathouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, brothel, house of ill repute, house of prostitution, sporting house, whorehouse |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| cerecloth | (noun) a waterproof waxed cloth once used as a shroud | - |
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| chaetognath | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: arrowworm |
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| chalcanthite | (noun) hydrated blue crystalline form of copper sulfate | Synonyms: blue copperas, blue stone, blue vitriol |
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| cheesecloth | (noun) a coarse loosely woven cotton gauze; originally used to wrap cheeses | - |
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| chemosynthesis | (noun) synthesis of carbohydrate from carbon dioxide and water; limited to certain bacteria and fungi | - |
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| chemotherapy | (noun) the use of chemical agents to treat or control disease (or mental illness) | - |
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| childbirth | (noun) the parturition process in human beings; having a baby; the process of giving birth to a child | Synonyms: accouchement, childbearing, vaginal birth |
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| chlorothiazide | (noun) a diuretic drug (trade name Diuril) used in the treatment of edema and hypertension | Synonyms: Diuril |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| cholelithiasis | (noun) the presence of gallstones in the gallbladder | - |
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