Source : Webster's Revised Unabridged Dictionary (1913)

Madrepore \Mad"re*pore\, n. [F. madrepore, perh. fr. madr['e]
   spotted, fr. OF. madre, mazre, a kind of knotty wood with
   brown spots, fr. OHG. masar a knot, grain, or vein in wood, a
   speck, G. maser + pore (see {Pore}); or perh. F. madr['e]pore
   is rather from It. madrepora, and this perh. fr. It. madre
   mother (see {Mother}) + Gr. ? a soft stone.] (Zo["o]l.)
   Any coral of the genus Madrepora; formerly, often applied to
   any stony coral.

Source : WordNet®

madrepore
     n : corals having calcareous skeletons aggregations of which
         form reefs and islands [syn: {stony coral}, {madriporian
         coral}]