mad·re·pore (mād'rə-pôr', -pōr') n. Any of various stony corals of the order Madreporaria, which includes the reef builders of tropical seas.
[Italian madrepora : madre, mother (from Latin māter, mātr-; see māter- in Indo-European roots) + -pora (alteration of poro, tufa, pore, from Late Latin porus, passageway; see pore2, or from Latin pōrus, calcareous stone, stalactite, from Greek pōros).] mad're·po'ri·an adj., mad're·por'ic adj.