| abbot | (noun) the superior of an abbey of monks | Synonyms: archimandrite |
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| abocclusion | (noun) the condition in which the upper teeth do not touch the lower teeth when biting | - |
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| abode | (noun) housing that someone is living in | Synonyms: domicile, dwelling, dwelling house, habitation, home |
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| (noun) any address at which you dwell more than temporarily | Synonyms: residence |
| abohm | (noun) a unit of resistance equal to a billionth of an ohm | - |
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| abolishment | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolition |
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| abolition | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolishment |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| abomasum | (noun) the fourth compartment of the stomach of a ruminant; the one where digestion takes place | Synonyms: fourth stomach |
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| abomination | (noun) an action that is vicious or vile; an action that arouses disgust or abhorrence | - |
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| (noun) hate coupled with disgust | Synonyms: abhorrence, detestation, execration, loathing, odium |
| (noun) a person who is loathsome or disgusting | - |
| abominator | (noun) one who hates or loathes | Synonyms: loather |
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| aboriginal | (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
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| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abort | (noun) the act of terminating a project or procedure before it is completed | - |
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| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| abortifacient | (noun) a drug (or other chemical agent) that causes abortion | Synonyms: aborticide, abortion-inducing drug |
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| abortion | (noun) termination of pregnancy | - |
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| (noun) failure of a plan | Synonyms: miscarriage |
| abortionist | (noun) a person (who should be a doctor) who terminates pregnancies | - |
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| abortus | (noun) a human fetus whose weight is less than 0.5 kilogram when removed or expelled from the mother's body | - |
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| aboulia | (noun) a loss of will power | Synonyms: abulia |
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| above | (noun) an earlier section of a written text | - |
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| adobo | (noun) a dish of marinated vegetables and meat or fish; served with rice | - |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| ambo | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: dais, podium, pulpit, rostrum, soapbox, stump |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| anabolism | (noun) the synthesis in living organisms of more complex substances (e.g., living tissue) from simpler ones together with the storage of energy | Synonyms: constructive metabolism |
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| angwantibo | (noun) a kind of yellow or golden lemur (Arctocebus calabarensis) | Synonyms: Arctocebus calabarensis, golden potto |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| antibody | (noun) any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| baboo | (noun) used as a Hindi courtesy title; equivalent to English `Mr' | Synonyms: babu |
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| baboon | (noun) large terrestrial monkeys having doglike muzzles | - |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| backbone | (noun) the part of a network that connects other networks together | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: spine |
| (noun) fortitude and determination | Synonyms: grit, gumption, guts, moxie, sand |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, rachis, spinal column, spine, vertebral column |
| (noun) a central cohesive source of support and stability | Synonyms: anchor, keystone, linchpin, lynchpin, mainstay |
| balboa | (noun) the basic unit of money in Panama; equal to 100 centesimos | - |
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| bamboo | (noun) woody tropical grass having hollow woody stems; mature canes used for construction and furniture | - |
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| (noun) the hard woody stems of bamboo plants; used in construction and crafts and fishing poles | - |
| bandbox | (noun) a light cylindrical box for holding light articles of attire (especially hats) | - |
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| bankbook | (noun) a record of deposits and withdrawals and interest held by depositors at certain banks | Synonyms: passbook |
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| bareboat | (noun) a vessel (such as a yacht) that can be chartered without a captain or crew or provisions | - |
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| bareboating | (noun) boating by chartering a bareboat and providing your own crew and provisions | - |
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| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| bebop | (noun) an early form of modern jazz (originating around 1940) | Synonyms: bop |
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| bellboy | (noun) someone employed as an errand boy and luggage carrier around hotels | Synonyms: bellhop, bellman |
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| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| billabong | (noun) a branch of a river made by water flowing from the main stream only when the water level is high | - |
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| (noun) a stagnant pool of water in the bed of a stream that flows intermittently | - |
| billboard | (noun) large outdoor signboard | Synonyms: hoarding |
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| bimbo | (noun) a young woman indulged by rich and powerful older men | - |
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| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| bluebonnet | (noun) a brimless dark blue Scottish cap with a flat top and a plume on one side | Synonyms: Balmoral |
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| (noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States | Synonyms: buffalo clover, Lupinus subcarnosus, Texas bluebonnet |
| 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 |
| boa | (noun) any of several chiefly tropical constrictors with vestigial hind limbs | - |
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| (noun) a long thin fluffy scarf of feathers or fur | Synonyms: feather boa |
| boar | (noun) an uncastrated male hog | - |
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| (noun) Old World wild swine having a narrow body and prominent tusks from which most domestic swine come; introduced in United States | Synonyms: Sus scrofa, wild boar |
| board | (noun) a flat piece of material designed for a special purpose | - |
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| (noun) a table at which meals are served | Synonyms: dining table |
| (noun) electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices | Synonyms: control board, control panel, instrument panel, panel |
| (noun) a vertical surface on which information can be displayed to public view | Synonyms: display board, display panel |
| (noun) a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities | Synonyms: add-in, card, circuit board, circuit card, plug-in |
| (noun) a flat portable surface (usually rectangular) designed for board games | Synonyms: gameboard |
| (noun) food or meals in general | Synonyms: table |
| (noun) a committee having supervisory powers | - |
| (noun) a stout length of sawn timber; made in a wide variety of sizes and used for many purposes | Synonyms: plank |
| boarder | (noun) a tenant in someone's house | Synonyms: lodger, roomer |
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| (noun) a pupil who lives at school during term time | - |
| (noun) someone who forces their way aboard ship | - |
| boarding | (noun) the act of passengers and crew getting aboard a ship or aircraft | Synonyms: embarkation, embarkment |
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| (noun) a structure of boards | - |
| boardinghouse | (noun) a private house that provides accommodations and meals for paying guests | Synonyms: boarding house |
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| boardroom | (noun) a room where a committee meets (such as the board of directors of a company) | Synonyms: council chamber |
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| boards | (noun) (used in the plural) the boarding that surrounds an ice hockey rink | - |
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| (noun) (used in the plural) the stage of a theater | - |
| boardwalk | (noun) a walkway made of wooden boards; usually at seaside | - |
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| boarfish | (noun) fish with a projecting snout | Synonyms: Capros aper |
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| (noun) fish with large eyes and long snouts | - |
| boarhound | (noun) large hound used in hunting wild boars | - |
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| boast | (noun) speaking of yourself in superlatives | Synonyms: boasting, jactitation, self-praise |
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| boaster | (noun) a very boastful and talkative person | Synonyms: blowhard, braggart, bragger, line-shooter, vaunter |
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| boastfulness | (noun) outspoken conceit | Synonyms: vainglory |
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| boasting | (noun) speaking of yourself in superlatives | Synonyms: boast, jactitation, self-praise |
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| boat | (noun) a small vessel for travel on water | - |
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| (noun) a dish (often boat-shaped) for serving gravy or sauce | Synonyms: gravy boat, gravy holder, sauceboat |
| boatbill | (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, broadbill, Cochlearius cochlearius |
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| boatbuilder | (noun) a person who builds boats | - |
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| boater | (noun) a stiff hat made of straw with a flat crown | Synonyms: leghorn, Panama, Panama hat, sailor, skimmer, straw hat |
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| (noun) someone who drives or rides in a boat | Synonyms: boatman, waterman |
| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| boating | (noun) water travel for pleasure | Synonyms: yachting |
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| boatload | (noun) the amount of cargo that can be held by a boat or ship or a freight car | Synonyms: carload, shipload |
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| boatman | (noun) someone who drives or rides in a boat | Synonyms: boater, waterman |
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| boatmanship | (noun) skill in handling boats | - |
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| boatswain | (noun) a petty officer on a merchant ship who controls the work of other seamen | Synonyms: bo's'n, bo'sun, bos'n, bosun |
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| boatyard | (noun) a place where boats are built or maintained or stored | - |
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| bob | (noun) a short abrupt inclination (as of the head) | - |
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| (noun) a short or shortened tail of certain animals | Synonyms: bobtail, dock |
| (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bobber, bobfloat, cork |
| (noun) a hanging weight, especially a metal ball on a string | - |
| (noun) a long racing sled (for 2 or more people) with a steering mechanism | Synonyms: bobsled, bobsleigh |
| (noun) a hair style for women and children; a short haircut all around | - |
| (noun) a former monetary unit in Great Britain | Synonyms: British shilling, shilling |
| bobber | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobfloat, cork |
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| bobbin | (noun) a winder around which thread or tape or film or other flexible materials can be wound | Synonyms: reel, spool |
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| bobble | (noun) the momentary juggling of a batted or thrown baseball | - |
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| bobby | (noun) an informal term for a British policeman | - |
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