A polyp is a small animal that lives in the sea. It has a hollow body like a tube and long parts called tentacles around its mouth.
英英词典释义
Noun
1. a small vascular growth on the surface of a mucous membrane
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