Webster’s Revised Unabridged Dictionary · 1913
Madreporian
Mad′re·po′ri·an, Mad′re·po′ric, a. (Zoöl.) Resembling, or pertaining to, the genus Madrepora.
Madreporic plate (Zoöl.), a perforated plate in echinoderms, through which water is admitted to the ambulacral tubes; — called also madreporic tubercule.