/ Dictionary / Index C carboxyl: Meaning and Definition of Find definitions for: car•box•yl Pronunciation: (kär-bok'sil), [key] — adj. containing the carboxyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: carboxyl (Thesaurus) Carborundum carboxylase Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language