polyp

n. small growth protruding from a mucous membrane

In zoology, a polyp is one of five forms of individuals found in many species of cnidarians. The two are the polyp or hydroid and the medusa. Polyps are approximately cylindrical, elongated on the axis of the body. The aboral end is attached either to the substrate by means of a disc-like holdfast if the polyp is solitary, or is connected to other polyps, either directly or indirectly, if the polyp is part of a colony. The oral end bears the mouth, and is surrounded by a circlet of tentacles.
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Polyp /pol·yp/ any growth or mass protruding from a mucous membrane. adenomatous polyp a benign neoplastic growth with variable malignant [more]Polyp - Community and Resources

Noun
1. a small vascular growth on the surface of a mucous membrane
(synonym) polypus
(hypernym) growth
(hyponym) adenomatous polyp
2. one of two forms that coelenterates take e.g. a hydra or coral: usually sedentary and has a hollow cylindrical body usually with a ring of tentacles around the mouth
(hypernym) coelenterate, cnidarian
(member-holonym) Cnidaria, phylum Cnidaria, Coelenterata, phylum Coelenterata

n. polyp, polypus, small growth protruding from a mucous membrane