carboxyl group

the univalent radical COOH, present in and characteristic of organic acids.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carboxyl group or carboxyl radical (kɑːˈbɒksaɪl, -sɪl, kɑːˈbɒksaɪl, -sɪl)
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]
carboxyl radical or carboxyl radical
[C19 carboxyl, from carbo- + oxy-² + -yl]

Collins English Dictionary - Complete & Unabridged 10th Edition
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