(noun.) 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'.
(noun.) a small vascular growth on the surface of a mucous membrane.
编辑:陌莉
录入:赛斯