polypoidPronunciation: /ˈpɒlɪpɔɪd/Definition of polypoid adjective 1 Zoology relating to or resembling a polyp or hydra: a polypoid colonial form relating to or denoting the polyp stage in the life cycle of a coelenterate. Also called hydroid.Compare with medusoid. 2 Medicine (of a growth) resembling or in the form of a polyp: a benign polypoid lesionpolypoid in other Oxford dictionaries Definition of polypoid in the US English dictionary