| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| arb | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arbitrager, arbitrageur |
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| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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| arbalist | (noun) late version of the crossbow with a steel bow | Synonyms: arbalest |
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| (noun) archer who uses an arbalest | - |
| arbiter | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbitrator, umpire |
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| (noun) someone with the power to settle matters at will | Synonyms: supreme authority |
| arbitrable | (adjective) appropriate for or subject to settlement by arbitration | - |
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| arbitrage | (noun) a kind of hedged investment meant to capture slight differences in price; when there is a difference in the price of something on two different markets the arbitrageur simultaneously buys at the lower price and sells at the higher price | - |
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| (verb) practice arbitrage, as in the stock market | - |
| arbitrager | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrageur |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arbitral | (adjective) relating to or resulting from arbitration | Synonyms: arbitrational |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrarily | (adverb) in a random manner | Synonyms: at random, every which way, haphazardly, indiscriminately, randomly, willy-nilly |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arbitrary | (adjective) based on or subject to individual discretion or preference or sometimes impulse or caprice | - |
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| arbitrate | (verb) act between parties with a view to reconciling differences | Synonyms: intercede, intermediate, liaise, mediate |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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| arbitrative | (adjective) relating to or having the authority to arbitrate | - |
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| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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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) | - |
| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arborary | (adjective) of or relating to or formed by trees | Synonyms: arboreal, arborical, arborous |
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| arboreal | (adjective) inhabiting or frequenting trees | Synonyms: arboreous, tree-living |
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| (adjective) of or relating to or formed by trees | Synonyms: arborary, arborical, arborous |
| (adjective) resembling a tree in form and branching structure | Synonyms: arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboresque | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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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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| arboriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborise | (verb) branch out like trees | Synonyms: arborize |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborize | (verb) branch out like trees | Synonyms: arborise |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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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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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| barb | (noun) one of the parallel filaments projecting from the main shaft of a feather | - |
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| (noun) a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove | - |
| (noun) the pointed part of barbed wire | - |
| (noun) an aggressive remark directed at a person like a missile and intended to have a telling effect | Synonyms: dig, gibe, jibe, shaft, shot, slam |
| (verb) provide with barbs | - |
| barbacan | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbican |
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| barbarian | (adjective) without civilizing influences | Synonyms: barbaric, savage, uncivilised, uncivilized, wild |
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| (noun) a member of an uncivilized people | Synonyms: savage |
| (noun) a crude uncouth ill-bred person lacking culture or refinement | Synonyms: boor, churl, Goth, peasant, tike, tyke |
| barbaric | (adjective) without civilizing influences | Synonyms: barbarian, savage, uncivilised, uncivilized, wild |
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| (adjective) unrestrained and crudely rich | - |
| barbarisation | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarization |
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| barbarise | (verb) make crude or savage in behavior or speech | Synonyms: barbarize |
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| (verb) become crude or savage or barbaric in behavior or language | Synonyms: barbarize |
| barbarism | (noun) a brutal barbarous savage act | Synonyms: barbarity, brutality, savagery |
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| barbarity | (noun) a brutal barbarous savage act | Synonyms: barbarism, brutality, savagery |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarousness, heinousness |
| barbarization | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarisation |
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| barbarize | (verb) make crude or savage in behavior or speech | Synonyms: barbarise |
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| (verb) become crude or savage or barbaric in behavior or language | Synonyms: barbarise |
| barbarous | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: brutal, cruel, fell, roughshod, savage, vicious |
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| (adjective) primitive in customs and culture | - |
| barbarously | (adverb) in a barbarous manner | - |
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| barbarousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarity, heinousness |
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| barbasco | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: Jacquinia keyensis, joewood |
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| barbate | (adjective) having hair on the cheeks and chin | Synonyms: bearded, bewhiskered, whiskered, whiskery |
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| barbecue | (noun) a rack to hold meat for cooking over hot charcoal usually out of doors | Synonyms: barbeque |
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| (noun) a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit | Synonyms: barbeque |
| (noun) meat that has been barbecued or grilled in a highly seasoned sauce | Synonyms: barbeque |
| (verb) cook outdoors on a barbecue grill | Synonyms: barbeque, cook out |
| barbecued | (adjective) cooked over an outdoor grill | Synonyms: grilled |
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| barbecuing | (noun) roasting a large piece of meat on a revolving spit out of doors over an open fire | - |
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| barbed | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, setose, spiny, thorny |
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| (adjective) capable of wounding | Synonyms: biting, mordacious, nipping, pungent |
| barbel | (noun) slender tactile process on the jaws of a fish | Synonyms: feeler |
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| barbell | (noun) a bar to which heavy discs are attached at each end; used in weightlifting | - |
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| barbellate | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, setose, spiny, thorny |
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| barbeque | (noun) a rack to hold meat for cooking over hot charcoal usually out of doors | Synonyms: barbecue |
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| (noun) a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit | Synonyms: barbecue |
| (noun) meat that has been barbecued or grilled in a highly seasoned sauce | Synonyms: barbecue |
| (verb) cook outdoors on a barbecue grill | Synonyms: barbecue, cook out |
| barber | (noun) a hairdresser who cuts hair and shaves beards as a trade | - |
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| (verb) perform the services of a barber: cut the hair and/or beard of | - |
| 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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| barbershop | (noun) a shop where men can get their hair cut | - |
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| barbet | (noun) small brightly colored stout-billed tropical bird having short weak wings | - |
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| barbette | (noun) (formerly) a mound of earth inside a fort from which heavy gun can be fired over the parapet | - |
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| barbican | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbacan |
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| barbital | (noun) a barbiturate used as a hypnotic | Synonyms: barbitone, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbiturate | (noun) organic compound having powerful soporific effect; overdose can be fatal | - |
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| barbu | (noun) found along western Atlantic coast | Synonyms: Polydactylus virginicus |
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| barbwire | (noun) strong wire with barbs at regular intervals used to prevent passage | Synonyms: barbed wire |
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| 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 |
| 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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| carbamate | (noun) a salt (or ester) of carbamic acid | - |
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| carbamide | (noun) the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics | Synonyms: urea |
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| carbide | (noun) a binary compound of carbon with a more electropositive element | - |
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| carbine | (noun) light automatic rifle | - |
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| carbineer | (noun) a soldier (historically a mounted soldier) who is armed with a carbine | Synonyms: carabineer, carabinier |
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| carbocyclic | (adjective) having or relating to or characterized by a ring composed of carbon atoms | - |
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| carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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| carbolated | (adjective) containing or treated with carbolic acid | - |
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| carbomycin | (noun) a colorless basic antibiotic that inhibits the growth of Gram-positive organisms | - |
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| carbon | (noun) a copy made with carbon paper | Synonyms: carbon copy |
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| (noun) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds | Synonyms: atomic number 6, C |
| (noun) a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper | Synonyms: carbon paper |
| carbonaceous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonic, carboniferous, carbonous |
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| carbonado | (noun) a piece of meat (or fish) that has been scored and broiled | - |
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| (noun) an inferior dark diamond used in industry for drilling and polishing | Synonyms: black diamond |
| carbonara | (noun) sauce for pasta; contains eggs and bacon or ham and grated cheese | - |
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| carbonate | (noun) a salt or ester of carbonic acid (containing the anion CO3) | - |
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| (verb) treat with carbon dioxide | - |
| (verb) turn into a carbonate | - |
| carbonated | (adjective) having carbonation (especially artificially carbonated) | - |
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| carbonation | (noun) saturation with carbon dioxide (as soda water) | - |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| carbonic | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonaceous, carboniferous, carbonous |
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| carboniferous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonaceous, carbonic, carbonous |
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| (adjective) of or relating to the Carboniferous geologic era | - |
| carbonisation | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonization |
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| carbonise | (verb) turn into carbon, as by burning | Synonyms: carbonize |
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| (verb) unite with carbon | Synonyms: carbonize, carburise, carburize |
| carbonization | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonisation |
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