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|Noun||1.||madriporian coral - corals having calcareous skeletons aggregations of which form reefs and islands|
coral - marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs
brain coral - massive reef-building coral having a convoluted and furrowed surface
mushroom coral - flattened disk-shaped stony coral (usually solitary and unattached)