the GNU version of the Collaborative International Dictionary of English
n. Any coral of the genus Madrepora, a group of corals having calcareous skeletons aggregations of which form reefs and islands; formerly, often applied to any stony coral.
The Century Dictionary and Cyclopedia
n. An animal, or a coral, of the genus Madrepora or family Madreporidœ; the polypite or the polypidom of a perforate madreporarian: a name loosely extended to any stone-coral with madre poriform cavities or openings.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. corals having calcareous skeletons aggregations of which form reefs and islands
Word Usage
"But in order to do this, he must have been thoroughly familiar with the enormous madrepore of the sewer in all its ramifications and in all its openings."