| carboxyl | (noun) the univalent radical -COOH; present in and characteristic of organic acids | Synonyms: carboxyl group |
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| 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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| epixylon | (noun) organisms that are attached to submerged wood surfaces in aquatic ecosystems. | - |
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| hydroxyl | (noun) the monovalent group -OH in such compounds as bases and some acids and alcohols | Synonyms: hydroxyl group, hydroxyl radical |
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| pyroxylin | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxyline |
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| pyroxyline | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxylin |
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| xylem | (noun) the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels | - |
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| xylene | (noun) a colorless flammable volatile liquid hydrocarbon used as a solvent | Synonyms: xylol |
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| xylol | (noun) a colorless flammable volatile liquid hydrocarbon used as a solvent | Synonyms: xylene |
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| xylometer | (noun) an instrument used to determine the specific gravity of wood | - |
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| xylophone | (noun) a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets | Synonyms: marimba |
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| xylophonist | (noun) someone who plays a xylophone | - |
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| xylose | (noun) a sugar extracted from wood or straw; used in foods for diabetics | Synonyms: wood sugar |
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| xylosma | (noun) shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China | Synonyms: Xylosma congestum |
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