/ Dictionary / Index C carboxylic acid: Meaning and Definition of Find definitions for: car'boxyl'ic ac'id Pronunciation: [key] — Chem. Chem. any organic acid containing one or more carboxyl groups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. carboxyl group carboxymethylcellulose Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language