| anechoic | (adjective) not having or producing echoes; sound-absorbent | - |
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| choice | (adjective) of superior grade | Synonyms: prime, prize, quality, select |
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| (adjective) appealing to refined taste | - |
| (noun) the act of choosing or selecting | Synonyms: option, pick, selection |
| (noun) the person or thing chosen or selected | Synonyms: pick, selection |
| (noun) one of a number of things from which only one can be chosen | Synonyms: alternative, option |
| choiceness | (noun) the quality of being very good indeed | Synonyms: fineness |
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| choir | (noun) the area occupied by singers; the part of the chancel between sanctuary and nave | - |
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| (noun) a chorus that sings as part of a religious ceremony | - |
| (noun) a family of similar musical instrument playing together | Synonyms: consort |
| (verb) sing in a choir | Synonyms: chorus |
| choirboy | (noun) a boy who sings in a choir | - |
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| choirmaster | (noun) the musical director of a choir | Synonyms: cantor, precentor |
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| conchoid | (noun) Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts). | - |
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| echoic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: imitative, onomatopoeic, onomatopoeical, onomatopoetic |
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| (adjective) like or characteristic of an echo | Synonyms: echolike |
| echoing | (adjective) (of sounds) repeating by reflection | Synonyms: reechoing |
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| eunuchoidism | (noun) the state of being a eunuch (either because of lacking testicles or because they failed to develop) | Synonyms: male hypogonadism |
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| nonechoic | (adjective) not echoic or imitative of sound | - |
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| pakchoi | (noun) Asiatic plant grown for its cluster of edible white stalks with dark green leaves | Synonyms: bok choi, bok choy, Brassica rapa chinensis, Chinese white cabbage, pak choi |
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| reechoing | (adjective) (of sounds) repeating by reflection | Synonyms: echoing |
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