| achillea | (noun) any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads | - |
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| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| ancillary | (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, appurtenant, auxiliary |
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| anthill | (noun) a mound of earth made by ants as they dig their nest | Synonyms: formicary |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| argillite | (noun) a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages | - |
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| arillate | (adjective) (of some seeds) having a fleshy and usually brightly colored cover | Synonyms: ariled |
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| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| armilla | (noun) (archeology) a bracelet worn around the wrist or arm | - |
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| (noun) a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars | Synonyms: armillary sphere |
| armillary | (adjective) of or relating to bracelets | - |
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| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| aspergill | (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspersorium |
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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 |
| axilla | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: armpit, axillary cavity, axillary fossa |
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| axillary | (adjective) of or relating to the armpit | - |
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| (adjective) of or relating to the axil | Synonyms: alar |
| bacillar | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillary |
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| (adjective) formed like a bacillus | Synonyms: bacillary, bacilliform, baculiform, rod-shaped |
| bacillary | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillar |
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| (adjective) formed like a bacillus | Synonyms: bacillar, bacilliform, baculiform, rod-shaped |
| bacilliform | (adjective) formed like a bacillus | Synonyms: bacillar, bacillary, baculiform, rod-shaped |
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| bacillus | (noun) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil | Synonyms: B |
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| banderilla | (noun) a decorated dart that is implanted in the neck or shoulders of the bull during a bull fight | - |
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| banderillero | (noun) the bullfighter who implants decorated darts (banderillas) into the neck or shoulders of the bull during a bull fight | - |
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| barilla | (noun) Algerian plant formerly burned to obtain calcium carbonate | Synonyms: Halogeton souda |
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| (noun) bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash | Synonyms: glasswort, kali, kelpwort, Salsola kali, Salsola soda, saltwort |
| bastille | (noun) a jail or prison (especially one that is run in a tyrannical manner) | - |
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| bazillion | (noun) a very large indefinite number (usually hyperbole) | Synonyms: billion, gazillion, jillion, million, trillion, zillion |
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| benzylpenicillin | (noun) the penicillin that constitutes the principal component of many commercial antibiotics | Synonyms: penicillin G |
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| bill | (noun) the entertainment offered at a public presentation | - |
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| (noun) horny projecting mouth of a bird | Synonyms: beak, neb, nib, pecker |
| (noun) a brim that projects to the front to shade the eyes | Synonyms: eyeshade, peak, visor, vizor |
| (noun) a cutting tool with a sharp edge | Synonyms: billhook |
| (noun) a sign posted in a public place as an advertisement | Synonyms: card, notice, placard, poster, posting |
| (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, invoice |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: broadsheet, broadside, circular, flier, flyer, handbill, throwaway |
| (noun) a statute in draft before it becomes law | Synonyms: measure |
| (noun) a list of particulars (as a playbill or bill of fare) | - |
| (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, Federal Reserve note, government note, greenback, note |
| (verb) advertise especially by posters or placards | - |
| (verb) publicize or announce by placards | Synonyms: placard |
| (verb) demand payment | Synonyms: charge |
| 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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| billed | (adjective) having a beak or bill as specified | - |
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| billet | (noun) lodging for military personnel (especially in a private home) | - |
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| (noun) a short personal letter | Synonyms: line, note, short letter |
| (verb) provide housing for (military personnel) | Synonyms: canton, quarter |
| billfish | (noun) giant warm-water game fish having a prolonged and rounded toothless upper jaw | - |
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| (noun) elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters | Synonyms: gar, needlefish |
| (noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth | Synonyms: gar, garfish, garpike, Lepisosteus osseus |
| (noun) slender long-beaked fish of temperate Atlantic waters | Synonyms: saury, Scomberesox saurus |
| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| billhook | (noun) a cutting tool with a sharp edge | Synonyms: bill |
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| billiard | (adjective) of or relating to billiards | - |
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| billiards | (noun) any of several games played on rectangular cloth-covered table (with cushioned edges) in which long tapering cue sticks are used to propel ivory (or composition) balls | - |
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| billing | (noun) request for payment of a debt | Synonyms: charge |
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| billingsgate | (noun) foul-mouthed or obscene abuse | Synonyms: scurrility |
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| billion | (adjective) denoting a quantity consisting of one thousand million items or units in the United States | - |
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| (adjective) denoting a quantity consisting of one million million items or units in Great Britain | - |
| (noun) the number that is represented as a one followed by 9 zeros | Synonyms: 1000000000, one thousand million |
| (noun) the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen | Synonyms: 1000000000000, one million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, gazillion, jillion, million, trillion, zillion |
| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| 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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| billy | (noun) male goat | Synonyms: billy goat, he-goat |
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| (noun) a short stout club used primarily by policemen | Synonyms: baton, billy club, billystick, nightstick, truncheon |
| billyo | (noun) an unimaginably large amount | Synonyms: all get out, billy-ho, billyoh |
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| billyoh | (noun) an unimaginably large amount | Synonyms: all get out, billy-ho, billyo |
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| billystick | (noun) a short stout club used primarily by policemen | Synonyms: baton, billy, billy club, nightstick, truncheon |
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| bimillenary | (noun) a span of 2000 years | Synonyms: bimillennium |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillennium |
| bimillenial | (adjective) of or relating to a bimillennium | - |
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| bimillennium | (noun) a span of 2000 years | Synonyms: bimillenary |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillenary |
| blanquillo | (noun) important marine food fishes | Synonyms: tilefish |
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| bluebill | (noun) diving ducks of North America having a bluish-grey bill | Synonyms: broadbill, scaup, scaup duck |
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| bluegill | (noun) important edible sunfish of eastern and central United States | Synonyms: Lepomis macrochirus |
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| boatbill | (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, broadbill, Cochlearius cochlearius |
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| bougainvillea | (noun) any of several South American ornamental woody vines of the genus Bougainvillea having brilliant red or purple flower bracts; widely grown in warm regions | - |
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| bouillabaisse | (noun) highly seasoned Mediterranean soup or stew made of several kinds of fish and shellfish with tomatoes and onions or leeks and seasoned with saffron and garlic and herbs | - |
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| bouillon | (noun) a clear seasoned broth | - |
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| braille | (noun) a point system of writing in which patterns of raised dots represent letters and numerals | - |
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| (verb) transcribe in braille | - |
| brill | (noun) European food fish | Synonyms: Scophthalmus rhombus |
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| brilliance | (noun) a light within the field of vision that is brighter than the brightness to which the eyes are adapted | Synonyms: blaze, glare |
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| (noun) the quality of being magnificent or splendid or grand | Synonyms: grandeur, grandness, magnificence, splendor, splendour |
| (noun) unusual mental ability | Synonyms: genius |
| brilliancy | (noun) a quality that outshines the usual | Synonyms: luster, lustre, splendor, splendour |
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| brilliant | (adjective) full of light; shining intensely | - |
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| (adjective) having strong or striking color | Synonyms: bright, vivid |
| (adjective) characterized by grandeur | Synonyms: glorious, magnificent, splendid |
| (adjective) having or marked by unusual and impressive intelligence | Synonyms: brainy, smart as a whip |
| (adjective) clear and sharp and ringing | Synonyms: bright |
| (adjective) of surpassing excellence | Synonyms: superb |
| brilliantine | (noun) a pomade to make the hair manageable and lustrous | - |
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| brilliantly | (adverb) in an extremely intelligent way | - |
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| (adverb) with brightness | Synonyms: bright, brightly |
| broadbill | (noun) small birds of the Old World tropics having bright plumage and short wide bills | - |
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| (noun) freshwater duck of the Northern Hemisphere having a broad flat bill | Synonyms: Anas clypeata, shoveler, shoveller |
| (noun) diving ducks of North America having a bluish-grey bill | Synonyms: bluebill, scaup, scaup duck |
| (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, boatbill, Cochlearius cochlearius |
| caimitillo | (noun) tropical American timber tree with dark hard heavy wood and small plumlike purple fruit | Synonyms: Chrysophyllum oliviforme, damson plum, satin leaf, satinleaf |
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| calabazilla | (noun) perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit | Synonyms: buffalo gourd, Cucurbita foetidissima, Missouri gourd, prairie gourd, prairie gourd vine, wild pumpkin |
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| camarilla | (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: cabal, faction, junto |
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| candelilla | (noun) wax-coated shrub of northern Mexico and southwestern United States | Synonyms: Euphorbia antisyphilitica |
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| (noun) wax-coated Mexican shrub related to Euphorbia antisyphilitica | Synonyms: Pedilanthus bracteatus, Pedilanthus pavonis |
| cantillate | (verb) recite with musical intonation; recite as a chant or a psalm | Synonyms: chant, intonate, intone |
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| cantillation | (noun) liturgical chanting | - |
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| capercaillie | (noun) large black Old World grouse | Synonyms: capercailzie, horse of the wood, Tetrao urogallus |
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| capillarity | (noun) a phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillaries | Synonyms: capillary action |
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| capillary | (adjective) of or relating to hair | - |
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| (adjective) long and slender with a very small internal diameter | Synonyms: hairlike |
| (noun) a tube of small internal diameter; holds liquid by capillary action | Synonyms: capillary tube, capillary tubing |
| (noun) any of the minute blood vessels connecting arterioles with venules | Synonyms: capillary vessel |
| carillon | (noun) playing a set of bells that are (usually) hung in a tower | Synonyms: bell ringing, carillon playing |
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| (noun) set of bells hung in a bell tower | - |
| carillonneur | (noun) a musician who plays a carillon | - |
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| cascarilla | (noun) West Indian shrub with aromatic bark | Synonyms: Croton eluteria |
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| caterpillar | (noun) a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth | - |
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| caviller | (noun) a disputant who quibbles; someone who raises annoying petty objections | Synonyms: caviler, pettifogger, quibbler |
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| cedilla | (noun) a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s | - |
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| chenille | (noun) a heavy fabric woven with chenille cord; used in rugs and bedspreads | - |
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| (noun) a soft tufted cord used in embroidery | Synonyms: chenille cord |
| chill | (noun) coldness due to a cold environment | Synonyms: gelidity, iciness |
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| (noun) a sudden numbing dread | Synonyms: pall |
| (noun) an almost pleasurable sensation of fright | Synonyms: frisson, quiver, shiver, shudder, thrill, tingle |
| (noun) a sensation of cold that often marks the start of an infection and the development of a fever | Synonyms: shivering |
| (verb) loose heat | Synonyms: cool, cool down |
| (verb) make cool or cooler | Synonyms: cool, cool down |
| (verb) depress or discourage | - |
| chiller | (noun) excitation that makes your hair stand up or that chills your bones | Synonyms: hair-raiser |
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| chilli | (noun) very hot and finely tapering pepper of special pungency | Synonyms: chile, chili, chili pepper, chilly |
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| chilliness | (noun) the property of being moderately cold | Synonyms: coolness, nip |
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| (noun) a lack of affection or enthusiasm | Synonyms: coldness, coolness, frigidity, frigidness, iciness |
| chilling | (adjective) provoking fear or terror | Synonyms: scary, shivery, shuddery |
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| (noun) the process of becoming cooler; a falling temperature | Synonyms: cooling, temperature reduction |
| chilly | (adjective) appreciably or disagreeably cold | Synonyms: parky |
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| (adjective) not characterized by emotion | - |
| (adjective) lacking warmth of feeling | - |
| (noun) very hot and finely tapering pepper of special pungency | Synonyms: chile, chili, chili pepper, chilli |
| chinchilla | (noun) small rodent with soft pearly grey fur; native to the Andes but bred in captivity for fur | Synonyms: Chinchilla laniger |
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| (noun) a thick twilled fabric of wool and cotton | - |
| (noun) the expensive silvery grey fur of the chinchilla | - |
| chinchillon | (noun) gregarious burrowing rodent larger than the chinchillas | Synonyms: Lagostomus maximus, viscacha |
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| cigarillo | (noun) small cigar or cigarette wrapped in tobacco instead of paper | - |
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| civilly | (adverb) in a civil manner | - |
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| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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| coloradillo | (noun) handsome shrub with showy orange to scarlet or crimson flowers; Florida and West Indies to Mexico and Brazil | Synonyms: Hamelia erecta, Hamelia patens, scarlet bush, scarlet hamelia |
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| coquille | (noun) a dish in the form of a scallop shell | - |
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| (noun) seafood served in a scallop shell | - |
| coronilla | (noun) any of various plants of the genus Coronilla having purple or pink or yellow flowers in long axillary heads or umbels | - |
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