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The Collaborative International Dictionary
monocarboxylic

monocarbonic \mon`o*car*bon"ic\, monocarboxylic \mon`o*car*box*yl"ic\, a. [Mono- + carbonic.] (Chem.) Containing one carboxyl group; as, acetic acid is a monocarbonic acid. The more common term is monocarboxylic. Contrasted with dicarboxylic, tricarboxylic, etc.

Wiktionary
monocarboxylic

a. (context organic chemistry English) Having a single carboxyl or carboxylic acid group

WordNet
monocarboxylic

adj. containing one carboxyl group