carboxyl group(redirected from carboxyl radical)
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carboxyl group(kɑːˈbɒksaɪl; -sɪl) or
(Elements & Compounds) the monovalent group –COOH, consisting of a carbonyl group bound to a hydroxyl group: the functional group in organic acids
[C19 carboxyl, from carbo- + oxy-2 + -yl]