/ Dictionary / Index C coolth: Meaning and Definition of Find definitions for: coolth Pronunciation: (klth), [key] — n. Usually Facetious. coolness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cool jazz cooly Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language