/ Dictionary / Index C carbonic: Meaning and Definition of Find definitions for: car•bon•ic Pronunciation: (kär-bon'ik), [key] — adj. containing tetravalent carbon, as carbonic acid, HCO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: carbonic (Thesaurus) carbon hexachloride carbonic acid Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language