madrepore
noun
mad·re·pore ˈma-drə-ˌpȯr 
: any of various stony reef-building corals (order Madreporaria) of tropical seas that assume a variety of branching, encrusting, or massive forms
madreporian
ˌma-drə-ˈpȯr-ē-ən
adjective or noun madreporic
ˌma-drə-ˈpȯr-ik
adjective 
Word History
Etymology
French madrépore, from Italian madrepora, from madre mother (from Latin mater) + poro pore (from Latin porus) — more at mother
First Known Use
1738, in the meaning defined above