Polyp

One of the feeding or nutritive zooids of a hydroid or coral.

One of the Anthozoa.

Same as Anthozoa. See Anthozoa, Madreporaria, Hydroid.

a small vascular growth on the surface of a mucous membrane

one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth; "in some species of coelenterate, polyps are a phase in the life cycle that alternates with a medusoid phase"