/ Dictionary / Index C carbonic anhydrase: Meaning and Definition of Find definitions for: carbon'ic an•hy'drase Pronunciation: (an-hī'drās, -drāz), [key] — Biochem. Biochem. an enzyme that catalyzes the reversible combination of carbon dioxide with water in red blood cells. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. carbonic-acid gas Carboniferous Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language