pol·yp /ˈpɑləp/
  水螅,鼻肉,鼻息肉
  pol·yp /ˈpɑləp/ 名詞
  Pol·yp n.  Zool. (a) One of the feeding or nutritive zooids of a hydroid or coral. (b) One of the Anthozoa. (c) pl. Same as Anthozoa. See Anthozoa, Madreporaria, Hydroid. [Written also polype.]
  Fresh-water polyp, the hydra.
  Polyp stem Zool., that portion of the stem of a siphonophore which bears the polypites, or feeding zooids.
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  polyp
       n 1: a small vascular growth on the surface of a mucous membrane
            [syn: polypus]
       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