/ Dictionary / Index M mother-of-pearl cloud: Meaning and Definition of Find definitions for: moth'er-of-pearl' cloud". Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mother-of-pearl mother-of-pearl glass Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language