| blastopore | (noun) the opening into the archenteron | - |
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| blastoporic | (adjective) of or relating to a blastopore | Synonyms: blastoporal |
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| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blastospheric | (adjective) of or relating to a blastula | Synonyms: blastular |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| blotto | (adjective) very drunk | Synonyms: besotted, blind drunk, cockeyed, crocked, fuddled, loaded, pie-eyed, pissed, pixilated, plastered, slopped, sloshed, smashed, soaked, soused, sozzled, squiffy, stiff, tight, wet |
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| blowtorch | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowlamp, torch |
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| bluestocking | (noun) a woman having literary or intellectual interests | Synonyms: bas bleu |
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| bluestone | (noun) bluish-grey sandstone used for paving and building | - |
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| bluetongue | (noun) a viral disease of sheep and cattle that is transmitted by biting midges | - |
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| bonito | (noun) any of various scombroid fishes intermediate in size and characteristics between mackerels and tunas | - |
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| (noun) fish whose flesh is dried and flaked for Japanese cookery; may be same species as skipjack tuna | Synonyms: Katsuwonus pelamis, oceanic bonito |
| (noun) flesh of mostly Pacific food fishes of the genus Sarda of the family Scombridae; related to but smaller than tuna | - |
| bookstore | (noun) a shop where books are sold | Synonyms: bookshop, bookstall |
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| botonee | (adjective) (of a heraldic cross) having a cluster of three buttons or knobs at the end of each arm | Synonyms: botonnee |
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| botonnee | (adjective) (of a heraldic cross) having a cluster of three buttons or knobs at the end of each arm | Synonyms: botonee |
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| bottom | (adjective) situated at the bottom or lowest position | - |
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| (adjective) the lowest rank | - |
| (noun) a cargo ship | Synonyms: freighter, merchant ship, merchantman |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| (noun) the lower side of anything | Synonyms: underside, undersurface |
| (noun) the lowest part of anything | - |
| (noun) a depression forming the ground under a body of water | Synonyms: bed |
| (noun) low-lying alluvial land near a river | Synonyms: bottomland |
| (noun) the second half of an inning; while the home team is at bat | Synonyms: bottom of the inning |
| (verb) come to understand | Synonyms: fathom, penetrate |
| (verb) strike the ground, as with a ship's bottom | - |
| (verb) provide with a bottom or a seat | - |
| bottomed | (adjective) having a bottom of a specified character | - |
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| bottomland | (noun) low-lying alluvial land near a river | Synonyms: bottom |
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| bottomless | (adjective) having no bottom | - |
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| (adjective) extremely deep | - |
| (adjective) unclothed especially below the waist or featuring such nudeness | - |
| (adjective) having no apparent limits or bounds | - |
| bottomlessness | (noun) the property of being very deep; without limit | - |
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| bottommost | (adjective) farthest down | Synonyms: lowermost, nethermost |
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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| boutonniere | (noun) a flower that is worn in a buttonhole | - |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| brainstorm | (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainwave, insight |
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| (verb) try to solve a problem by thinking intensely about it | - |
| brainstorming | (noun) a group problem-solving technique in which members spontaneously share ideas and solutions | - |
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| breakstone | (noun) any of various plants of the genus Saxifraga | Synonyms: rockfoil, saxifrage |
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| brimstone | (noun) an old name for sulfur | Synonyms: native sulfur, native sulphur |
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| bronchodilator | (noun) a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs | - |
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| brontosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaurus, thunder lizard |
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| brontosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaur, thunder lizard |
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| brownstone | (noun) a row house built of brownstone; reddish brown in color | - |
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| (noun) a reddish brown sandstone; used in buildings | - |
| bucktooth | (noun) a large projecting front tooth | - |
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| burrito | (noun) a flour tortilla folded around a filling | - |
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| buttock | (noun) either of the two large fleshy masses of muscular tissue that form the human rump | Synonyms: cheek |
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| buttocks | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| button | (noun) a round fastener sewn to shirts and coats etc to fit through buttonholes | - |
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| (noun) an electrical switch operated by pressing | Synonyms: push, push button |
| (noun) a device that when pressed will release part of a mechanism | Synonyms: release |
| (noun) any artifact that resembles a button | - |
| (noun) a specific area or icon in graphical user interface systems that is clicked or pressed in order to select a command or perform an action | - |
| (noun) a female sexual organ homologous to the penis | Synonyms: clit, clitoris |
| (noun) a round flat badge displaying information and suitable for pinning onto a garment | - |
| (noun) any of various plant parts that resemble buttons | - |
| (verb) fasten with buttons | - |
| (verb) provide with buttons | - |
| buttoned | (adjective) furnished or closed with buttons or something buttonlike | Synonyms: fastened |
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| buttonhole | (noun) a hole through which buttons are pushed | Synonyms: button hole |
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| (verb) detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors | Synonyms: lobby |
| buttonhook | (noun) a hook for pulling a button through a buttonhole | - |
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| buttonlike | (adjective) small and round and shiny like a shiny bead or button | Synonyms: beadlike, beady, buttony |
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| buttonwood | (noun) very large spreading plane tree of eastern and central North America to Mexico | Synonyms: American plane, American sycamore, Platanus occidentalis |
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| buttony | (adjective) ornamented with many buttons | - |
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| (adjective) small and round and shiny like a shiny bead or button | Synonyms: beadlike, beady, buttonlike |
| caespitose | (adjective) (of plants) growing in small dense clumps or tufts | Synonyms: cespitose, tufted |
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| caimito | (noun) evergreen tree of West Indies and Central America having edible purple fruit star-shaped in cross section and dark green leaves with golden silky undersides | Synonyms: Chrysophyllum cainito, star apple |
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| calamitous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, disastrous, fatal, fateful |
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| calcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: thyrocalcitonin |
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| calculator | (noun) a small machine that is used for mathematical calculations; can be mechanical or electronic | Synonyms: calculating machine |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: computer, estimator, figurer, reckoner |
| calefactory | (adjective) serving to heat | Synonyms: calefactive |
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| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| callosotomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosectomy |
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| calorisator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorizator |
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| calorizator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorisator |
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| calumniatory | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous, slanderous |
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| campstool | (noun) a folding stool | - |
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| canafistola | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistula, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canto | (noun) a major division of a long poem | - |
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| (noun) the highest part (usually the melody) in a piece of choral music | - |
| canton | (noun) a small administrative division of a country | - |
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| (verb) divide into cantons, of a country | - |
| (verb) provide housing for (military personnel) | Synonyms: billet, quarter |
| cantonal | (adjective) of or relating to a canton | - |
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| cantonment | (noun) temporary living quarters specially built by the army for soldiers | Synonyms: bivouac, camp, encampment |
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| cantor | (noun) the official of a synagogue who conducts the liturgical part of the service and sings or chants the prayers intended to be performed as solos | Synonyms: hazan |
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| (noun) the musical director of a choir | Synonyms: choirmaster, precentor |
| capacitor | (noun) an electrical device characterized by its capacity to store an electric charge | Synonyms: capacitance, condenser, electrical condenser |
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| capitol | (noun) a building occupied by a state legislature | - |
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| capstone | (noun) a stone that forms the top of wall or building | Synonyms: copestone, coping stone, stretcher |
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| (noun) a final touch; a crowning achievement; a culmination | Synonyms: copestone, finishing touch |
| captopril | (noun) a drug (trade name Capoten) that blocks the formation of angiotensin in the kidneys resulting in vasodilation; used in the treatment of hypertension and congestive heart failure | Synonyms: Capoten |
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| captor | (noun) a person who captures and holds people or animals | Synonyms: capturer |
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| caracolito | (noun) large Costa Rican tree having light-colored wood suitable for cabinetry; similar to the African lepidobotrys in wood structure as well as in fruit and flowers and leaves and seeds; often classified in other families | Synonyms: Ruptiliocarpon caracolito |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| carburetor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburettor |
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| carburettor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburetor |
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| carcinomatous | (adjective) being or relating to carcinoma | - |
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| cardiorespiratory | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiopulmonary |
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| carrottop | (noun) someone who has red hair | Synonyms: red-header, redhead, redheader |
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| cartographer | (noun) a person who makes maps | Synonyms: map maker |
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| cartographic | (adjective) of or relating to the making of maps or charts | Synonyms: cartographical |
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| cartographical | (adjective) of or relating to the making of maps or charts | Synonyms: cartographic |
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| cartography | (noun) the making of maps and charts | Synonyms: mapmaking |
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| carton | (noun) a box made of cardboard; opens by flaps on top | - |
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| (noun) the quantity contained in a carton | Synonyms: cartonful |
| cartonful | (noun) the quantity contained in a carton | Synonyms: carton |
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| cartoon | (noun) a humorous or satirical drawing published in a newspaper or magazine | Synonyms: sketch |
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| (noun) a film made by photographing a series of cartoon drawings to give the illusion of movement when projected in rapid sequence | Synonyms: animated cartoon, toon |
| (verb) draw cartoons of | - |
| cartoonist | (noun) a person who draws cartoons | - |
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| cartouch | (noun) a cartridge (usually with paper casing) | Synonyms: cartouche |
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| cartouche | (noun) a cartridge (usually with paper casing) | Synonyms: cartouch |
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| castor | (noun) a hat made with the fur of a beaver (or similar material) | Synonyms: beaver |
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| (noun) a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable | Synonyms: caster |
| (noun) a shaker with a perforated top for sprinkling powdered sugar | Synonyms: caster |
| castrato | (noun) a male singer who was castrated before puberty and retains a soprano or alto voice | - |
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| catatonia | (noun) a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement | Synonyms: catatonic schizophrenia, catatonic type schizophrenia |
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| (noun) extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia | - |
| catatonic | (adjective) characterized by catatonia especially either rigidity or extreme laxness of limbs | - |
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| catoptric | (adjective) of or relating to catoptrics; produced by or based on mirrors | Synonyms: catoptrical |
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| catoptrical | (adjective) of or relating to catoptrics; produced by or based on mirrors | Synonyms: catoptric |
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| catoptrics | (noun) branch of optics dealing with formation of images by mirrors | - |
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| catostomid | (noun) a cypriniform fish of the family Catostomidae | - |
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| cavetto | (noun) a concave molding shaped like a quarter circle in cross section | - |
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| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| celebratory | (adjective) used for celebrating | - |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| ceratodus | (noun) extinct lungfish | - |
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| ceratopsian | (noun) any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia | Synonyms: horned dinosaur |
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| ceratosaur | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaurus |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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