carboxyl group

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carboxyl group

The acidic functional group found in organic molecules, consisting of carbon with one doubled-bonded (carbonyl group) O2, and a single-bonded O2.
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carboxyl group

the monovalent group -COOH, found in aldehydes and ketones.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005