| biconcave | (adjective) concave on both sides | Synonyms: concavo-concave |
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| cavalcade | (noun) a procession of people traveling on horseback | - |
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| cavalier | (adjective) given to haughty disregard of others | Synonyms: high-handed |
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| (noun) a gallant or courtly gentleman | Synonyms: chevalier |
| cavalierly | (adverb) in a proud and domineering manner | Synonyms: disdainfully |
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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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| (verb) explore natural caves | Synonyms: spelunk |
| (verb) hollow out as if making a cave or opening | Synonyms: undermine |
| 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 | - |
| (verb) hollow out as if making a cavern | Synonyms: cavern out |
| cavernous | (adjective) filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood | Synonyms: erectile |
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| (adjective) being or suggesting a cavern | - |
| 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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| (verb) raise trivial objections | Synonyms: carp, chicane |
| 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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| cavitied | (adjective) pitted with cell-like cavities (as a honeycomb) | Synonyms: alveolate, faveolate, honeycombed, pitted |
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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 |
| cavort | (verb) play boisterously | Synonyms: disport, frisk, frolic, gambol, lark, lark about, rollick, romp, run around, skylark, sport |
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| 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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| concave | (adjective) curving inward | - |
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| concavely | (adverb) in a concave way | - |
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| concaveness | (noun) the property possessed by a concave shape | Synonyms: concavity |
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| concavity | (noun) the property possessed by a concave shape | Synonyms: concaveness |
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| (noun) a shape that curves or bends inward | Synonyms: concave shape, incurvation, incurvature |
| excavate | (verb) find by digging in the ground | Synonyms: dig up, turn up |
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| (verb) remove the inner part or the core of | Synonyms: dig, hollow |
| (verb) form by hollowing | - |
| (verb) recover through digging | Synonyms: unearth |
| excavation | (noun) the act of extracting ores or coal etc from the earth | Synonyms: mining |
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| (noun) the act of digging | Synonyms: dig, digging |
| (noun) a hole in the ground made by excavating | - |
| (noun) the site of an archeological exploration | Synonyms: archeological site, dig |
| excavator | (noun) a machine for excavating | Synonyms: digger, power shovel, shovel |
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| (noun) a workman who excavates for foundations of buildings or for quarrying | - |
| planoconcave | (adjective) flat on one side and concave on the other | - |
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| postcava | (noun) receives blood from lower limbs and abdominal organs and empties into the posterior part of the right atrium of the heart; formed from the union of the two iliac veins | Synonyms: inferior vena cava |
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| precava | (noun) receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins | Synonyms: superior vena cava |
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| scavenge | (verb) remove unwanted substances from | Synonyms: clean |
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| (verb) feed on carrion or refuse | - |
| (verb) clean refuse from | - |
| (verb) collect discarded material | Synonyms: salvage |
| scavenger | (noun) any animal that feeds on refuse and other decaying organic matter | - |
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| (noun) someone who collects things that have been discarded by others | Synonyms: magpie, pack rat |
| (noun) a chemical agent that is added to a chemical mixture to counteract the effects of impurities | - |