/ Dictionary / Index C cataclysmic: Meaning and Definition of Find definitions for: cat•a•clys•mic Pronunciation: (kat"u-kliz'mik), [key] — adj. of, pertaining to, or resulting from a cataclysm. of the nature of, or having the effect of, a cataclysm: cataclysmic changes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cataclysmic (Thesaurus) cataclysm catacomb Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language