| cation | (noun) a positively charged ion | - |
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| catkin | (noun) a cylindrical spikelike inflorescence | Synonyms: ament |
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| catling | (noun) a long double-edged knife used for amputations | - |
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| catmint | (noun) hairy aromatic perennial herb having whorls of small white purple-spotted flowers in a terminal spike; used in the past as a domestic remedy; strongly attractive to cats | Synonyms: catnip, Nepeta cataria |
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| catnap | (noun) sleeping for a short period of time (usually not in bed) | Synonyms: forty winks, light sleep, nap, short sleep, snooze |
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| catnip | (noun) hairy aromatic perennial herb having whorls of small white purple-spotted flowers in a terminal spike; used in the past as a domestic remedy; strongly attractive to cats | Synonyms: catmint, Nepeta cataria |
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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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| catsup | (noun) thick spicy sauce made from tomatoes | Synonyms: cetchup, ketchup, tomato ketchup |
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| cattail | (noun) tall erect herbs with sword-shaped leaves; cosmopolitan in fresh and salt marshes | - |
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| cattalo | (noun) hardy breed of cattle resulting from crossing domestic cattle with the American buffalo; yields leaner beef than conventional breeds | Synonyms: beefalo |
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| cattie | (noun) any of various units of weight used in southeastern Asia (especially a Chinese measure equal to 500 grams) | Synonyms: catty |
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| cattiness | (noun) malevolence by virtue of being malicious or spiteful or nasty | Synonyms: bitchiness, nastiness, spite, spitefulness |
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| cattle | (noun) domesticated bovine animals as a group regardless of sex or age | Synonyms: Bos taurus, cows, kine, oxen |
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| cattleman | (noun) a man who raises (or tends) cattle | Synonyms: beef man, cow man |
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| (noun) a male hired hand who tends cattle and performs other duties on horseback | Synonyms: cowboy, cowman |
| cattleship | (noun) a cargo ship for the transport of livestock | Synonyms: cattle boat |
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| cattleya | (noun) any orchid of the genus Cattleya characterized by a three-lobed lip enclosing the column; among the most popular and most extravagantly beautiful orchids known | - |
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| catty | (noun) any of various units of weight used in southeastern Asia (especially a Chinese measure equal to 500 grams) | Synonyms: cattie |
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| catwalk | (noun) narrow pathway high in the air (as above a stage or between parts of a building or along a bridge) | - |
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| (noun) narrow platform extending out into an auditorium | - |
| caucus | (noun) a closed political meeting | - |
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| cauda | (noun) any taillike structure | - |
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| caudate | (noun) amphibians that resemble lizards | Synonyms: urodele |
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| (noun) a tail-shaped basal ganglion located in a lateral ventricle of the brain | Synonyms: caudate nucleus |
| caudex | (noun) woody stem of palms and tree ferns | - |
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| (noun) persistent thickened stem of a herbaceous perennial plant | Synonyms: stock |
| caul | (noun) the inner membrane of embryos in higher vertebrates (especially when covering the head at birth) | Synonyms: embryonic membrane, veil |
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| (noun) part of the peritoneum attached to the stomach and to the colon and covering the intestines | Synonyms: gastrocolic omentum, greater omentum |
| cauldron | (noun) a very large pot that is used for boiling | Synonyms: caldron |
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| cauliflower | (noun) compact head of white undeveloped flowers | - |
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| (noun) a plant having a large edible head of crowded white flower buds | Synonyms: Brassica oleracea botrytis |
| caulk | (noun) a waterproof filler and sealant that is used in building and repair to make watertight | Synonyms: caulking |
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| caulking | (noun) a waterproof filler and sealant that is used in building and repair to make watertight | Synonyms: caulk |
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| causa | (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: case, cause, lawsuit, suit |
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| causalgia | (noun) a burning pain in a limb along the course of a peripheral nerve; usually associated with skin changes | - |
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| causality | (noun) the relation between causes and effects | - |
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| causation | (noun) the act of causing something to happen | Synonyms: causing |
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| cause | (noun) any entity that produces an effect or is responsible for events or results | Synonyms: causal agency, causal agent |
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| (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: case, causa, lawsuit, suit |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: campaign, crusade, drive, effort, movement |
| (noun) a justification for something existing or happening | Synonyms: grounds, reason |
| (noun) events that provide the generative force that is the origin of something | - |
| causerie | (noun) light informal conversation for social occasions | Synonyms: chin-wag, chin-wagging, chin wag, chin wagging, chit-chat, chit chat, chitchat, gab, gabfest, gossip, small talk, tittle-tattle |
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| causeway | (noun) a road that is raised above water or marshland or sand | - |
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| causing | (noun) the act of causing something to happen | Synonyms: causation |
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| caustic | (noun) the envelope of light rays reflected or refracted by a curved surface or object | - |
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| (noun) any chemical substance that burns or destroys living tissue | - |
| cauterant | (noun) an instrument or substance used to destroy tissue for medical reasons (e.g., removal of a wart) by burning it with a hot iron or an electric current or a caustic or by freezing it | Synonyms: cautery |
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| cauterisation | (noun) the act of coagulating blood and destroying tissue with a hot iron or caustic agent or by freezing | Synonyms: cauterization, cautery |
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| cauterization | (noun) the act of coagulating blood and destroying tissue with a hot iron or caustic agent or by freezing | Synonyms: cauterisation, cautery |
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| cautery | (noun) the act of coagulating blood and destroying tissue with a hot iron or caustic agent or by freezing | Synonyms: cauterisation, cauterization |
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| (noun) an instrument or substance used to destroy tissue for medical reasons (e.g., removal of a wart) by burning it with a hot iron or an electric current or a caustic or by freezing it | Synonyms: cauterant |
| caution | (noun) the trait of being cautious; being attentive to possible danger | Synonyms: carefulness, cautiousness |
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| (noun) the trait of being circumspect and prudent | Synonyms: circumspection |
| (noun) judiciousness in avoiding harm or danger | Synonyms: care, forethought, precaution |
| (noun) a warning against certain acts | Synonyms: caveat |
| cautious | (noun) people who are fearful and cautious | Synonyms: timid |
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| cautiousness | (noun) the trait of being cautious; being attentive to possible danger | Synonyms: carefulness, caution |
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| cavalcade | (noun) a procession of people traveling on horseback | - |
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| cavalier | (noun) a gallant or courtly gentleman | Synonyms: chevalier |
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| cavalla | (noun) large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil | Synonyms: cero, king mackerel, Scomberomorus cavalla |
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| cavalry | (noun) a highly mobile army unit | - |
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| (noun) troops trained to fight on horseback | Synonyms: horse, horse cavalry |
| cavalryman | (noun) a soldier mounted on horseback | Synonyms: trooper |
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| (noun) a soldier in a motorized army unit | Synonyms: trooper |
| cave | (noun) a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea | - |
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| caveat | (noun) a warning against certain acts | Synonyms: caution |
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| (noun) (law) a formal notice filed with a court or officer to suspend a proceeding until filer is given a hearing | - |
| caveman | (noun) someone who lives in a cave | Synonyms: cave dweller, cave man, troglodyte |
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| cavern | (noun) a large cave or a large chamber in a cave | - |
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| (noun) any large dark enclosed space | - |
| cavetto | (noun) a concave molding shaped like a quarter circle in cross section | - |
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| caviar | (noun) salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre | Synonyms: caviare |
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| caviare | (noun) salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre | Synonyms: caviar |
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| cavil | (noun) an evasion of the point of an argument by raising irrelevant distinctions or objections | Synonyms: quibble, quiddity |
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| caviler | (noun) a disputant who quibbles; someone who raises annoying petty objections | Synonyms: caviller, pettifogger, quibbler |
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| caviller | (noun) a disputant who quibbles; someone who raises annoying petty objections | Synonyms: caviler, pettifogger, quibbler |
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| cavity | (noun) (anatomy) a natural hollow or sinus within the body | Synonyms: bodily cavity, cavum |
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| (noun) a sizeable hole (usually in the ground) | Synonyms: pit |
| (noun) soft decayed area in a tooth; progressive decay can lead to the death of a tooth | Synonyms: caries, dental caries, tooth decay |
| (noun) space that is surrounded by something | Synonyms: enclosed space |
| cavum | (noun) (anatomy) a natural hollow or sinus within the body | Synonyms: bodily cavity, cavity |
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| cavy | (noun) short-tailed rough-haired South American rodent | - |
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| caw | (noun) the sound made by corvine birds | - |
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| cay | (noun) a coral reef off the southern coast of Florida | Synonyms: Florida key, key |
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| cayenne | (noun) ground pods and seeds of pungent red peppers of the genus Capsicum | Synonyms: cayenne pepper, red pepper |
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| (noun) a long and often twisted hot red pepper | Synonyms: cayenne pepper |
| (noun) plant bearing very hot and finely tapering long peppers; usually red | Synonyms: Capsicum annuum longum, cayenne pepper, chili pepper, chilli pepper, jalapeno, long pepper |
| cayman | (noun) a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly | Synonyms: caiman |
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| cayuse | (noun) a small native range horse | Synonyms: Indian pony |
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| cazique | (noun) black-and-red or black-and-yellow orioles of the American tropics | Synonyms: cacique |
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