/ Dictionary / Index M madreporite: Meaning and Definition of Find definitions for: mad•re•por•ite Pronunciation: (mad'ru-pôr"īt, -pōr"-, mu-drep'u-rīt"), [key] — n. a sievelike plate in certain echinoderms, through which water passes into the vascular system. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. madrepore Madrid Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language