coral

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coral

  1. the calcareous skeleton of certain COELENTERATES.
  2. the skeleton together with the animals which live in it and secrete it, the whole structure often forming a reef. The animals, usually anthozoans and hydrozans, have a POLYP structure.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Some of these habitats have existed for millions of years and have grown so large they resemble hills made of coral, called coral mounds.
This activity in turn attracts other sea animals--sponges, crustaceans, sea urchins, and snails among them--so that coral mounds become hot spots of biodiversity.
Dense schools offish are associated with deep coral mounds off Norway and with a kind of coral called octocorals on seamounts off New Zealand.