Как по Английски будет poliepen

noun

A solitary or colonial sedentary form of a coelenterate such as a sea anemone, typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles. in some species, polyps are a phase in the life cycle which alternates with a medusoid phase.

Примеры использования:

A few, such as hydra, are solitary polyps that lack a medusoid stage.