madreporite definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a porous calcareous plate in most echinoderms, through which the sea enters the water-vascular system
Origin: madrepore plush -ite
madreporite definition by American Heritage Dictionary
A perforated platelike structure in most echinoderms that forms the intake for their water-vascular systems.
Origin: So called because the perforations resemble those of a madrepore.