/ Dictionary / Index D dunce cap: Meaning and Definition of Find definitions for: dunce' cap" Pronunciation: [key] a tall, cone-shaped hat formerly worn by slow or lazy students as a punishment in school. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dunce Dunciad, The* Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language