Webster’s Revised Unabridged Dictionary · 1913
Polyp
Pol′yp (pŏl′ĭp), n. [L. polypus, Gr. πολύπους, πολύποδος, literally, many-footed; πολύς many + πούς, ποδός, foot: cf. F. polype. See Poly- and Foot, and cf. Polypode, Polypody, Poulp.] (Zoöl.) (a) One of the feeding or nutritive zooids of a hydroid or coral. (b) One of the Anthozoa. (c) pl. Same as Anthozoa. See Anthozoa, Madreporaria, Hydroid. [Written also polype.]
Fresh-water polyp, the hydra. — Polyp stem (Zoöl.), that portion of the stem of a siphonophore which bears the polypites, or feeding zooids.