ˈmadrəˌpō(ə)r noun
Etymology: French madrépore, from Italian madrepora, from madre mother (from Latin mater ) + -pora (from poro pore, from Latin porus ) — more at mother , pore
: any of various stony reef-building corals (order Madreporaria) of tropical seas that assume a variety of branching, encrusting, or massive forms and that include the staghorn corals, the brain corals, and the mushroom corals