A polyp is a small unhealthy growth on a surface inside your body, especially inside your nose.
例句
It takes ten years or more for a benign polyp to turn malignant.良性息肉轉為惡性要經過10年或更長的時間。
N-COUNT
水螅（體）
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.
英英詞典釋義
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