/ Dictionary / Index R rattlehead: Meaning and Definition of Find definitions for: rat•tle•head Pronunciation: (rat'l-hed"), [key] — n. a rattlebrain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rattle-bush rattlepate 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