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The Collaborative International Dictionary of English v.0.48:

Madreporian \Mad`re*po"ri*an\, Madreporic \Mad`re*po"ric\, a. (Zool.) Resembling, or pertaining to, the genus Madrepora. [1913 Webster] Madreporic plate (Zool.), a perforated plate in echinoderms, through which water is admitted to the ambulacral tubes; -- called also madreporic tubercule. [1913 Webster]