MAD'REPORE, noun A submarine substance of a stony hardness, resembling coral. It consists of carbonate of lime with some animal matter. It is of a white color, wrinkled on the surface, and full of cavities or cells, inhabited by a small animal. From a liquor discharged by this animal, the substance is said to be formed. Madrepores constitute a genus of polypiers, of variable forms, always garnished with radiated plates.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.