| carboxyl | (noun) the univalent radical -COOH; present in and characteristic of organic acids | Synonyms: carboxyl group |
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| chatterbox | (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterer, magpie, prater, spouter |
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| (noun) orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf | Synonyms: Epipactis gigantea, giant helleborine, stream orchid |
| cocarboxylase | (noun) a coenzyme important in respiration in the Krebs cycle | Synonyms: thiamine pyrophosphate |
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| decarboxylase | (noun) any of the enzymes that hydrolize the carboxyl group | - |
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| decarboxylation | (noun) the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen) | - |
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| gearbox | (noun) the shell (metal casing) in which a train of gears is sealed | Synonyms: gear box, gear case |
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| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| tinderbox | (noun) a box for holding tinder | - |
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| (noun) a dangerous state of affairs; a situation that is a potential source of violence | - |