/ Dictionary / Index T thunderclap: Meaning and Definition of Find definitions for: thun•der•clap Pronunciation: (thun'dur-klap"), [key] — n. a crash of thunder. something resembling a thunderclap, as in loudness or unexpectedness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thunderclap (Thesaurus) thunderbolt thundercloud Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language