Merriam-Webster Collegiate Dictionary - madrepore

 noun  Etymology: French madrepore, from Italian madrepora, from madre mother (from Latin mater) + poro pore (from Latin porus) — more at mother  Date: 1751 any of various stony reef-building corals (order Madreporaria) of tropical seas that assume a variety of branching, encrusting, or massive forms  • madreporian adjective or noun  • madreporic adjective