/ Dictionary / Index C crystal set: Meaning and Definition of Find definitions for: crys'tal set" Pronunciation: [key] an early, tubeless radio receiver using a crystal detector. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crystal pleat crystal system Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language