carboxyl group
carboxyl group car*box"yl group` (k[aum]r*b[o^]ks"[i^]l gr[=oo]p), n. (Chem.) a monovalent organic radical (written {-COOH}, {-CO2H} or {-CO.OH}) whose presence confers acidic properties on the compound containing it; -- called also {carboxylic group}. Monocarboxylic acids (such as acetic acid or butyric acid) have one carboxyl group, dicarboxylic acids (such as oxalic acid or malonic acid) have two, tricarboxylic acids (such as citric acid) have three. It is weakly acidic, the pKa of acetic acid being 4.75. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Carboxyl group — or CO2H is a functional group present in amino acids and carboxylic acids. Its structure is composed of one carbon atom attached to an oxygen atom by a double bond and to a hydroxyl group by a single bond. It is often mentioned that a carboxyl… …   Wikipedia

  • carboxyl group — n CARBOXYL …   Medical dictionary

  • carboxyl group — noun the univalent radical COOH; present in and characteristic of organic acids • Syn: ↑carboxyl • Derivationally related forms: ↑carboxyl (for: ↑carboxyl), ↑carboxylic (for: ↑ …   Useful english dictionary

  • carboxyl group — /kaˈbɒksəl grup / (say kah boksuhl groohp) noun a univalent group, –COOH, present in all organic acids. Also, carboxyl radical. {carb + ox(ygen) + yl} …   Australian English dictionary

  • carboxyl group — noun see carboxyl …   New Collegiate Dictionary

  • carboxyl group — the univalent radical COOH, present in and characteristic of organic acids. [1875 80] * * * …   Universalium

  • carboxyl — The characterizing group ( COOH) of certain organic acids; e.g., HCOOH (formic acid), CH3COOH (acetic acid), CH3CH(NH2)COOH (alanine), etc. Cf.:carboxylic acid. * * * car·box·yl kär bäk səl n a monovalent group COOH typical of organic acids… …   Medical dictionary

  • carboxyl — noun Etymology: International Scientific Vocabulary Date: 1869 a monovalent functional group or radical –COOH typical of organic acids called also carboxyl group • carboxylic adjective …   New Collegiate Dictionary

  • carboxyl — carboxylic, adj. /kahr bok sil/, adj. containing the carboxyl group. [1865 70; CARB + OX(YGEN) + YL] * * * …   Universalium

  • carboxyl methyltransferase — noun Any enzyme that catalyzes the methylation of a carboxyl group …   Wiktionary

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