Meaning : A small vascular growth on the surface of a mucous membrane.
Synonyms : polypus
Meaning : 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.
Example :
In some species of coelenterate, polyps are a phase in the life cycle that alternates with a medusoid phase.