Etymology
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polyp (n.)

c. 1400, "nasal tumor," from Old French polype and directly from Latin polypus "cuttlefish," also "nasal tumor," from Greek (Doric, Aeolic) polypos "octopus, cuttlefish," from polys "many" (from PIE root *pele- (1) "to fill") + pous "foot" (from PIE root *ped- "foot"). The etymological sense was revived 1742 as a name for hydras and sea anemones (earlier polypus, early 16c.). The Latin word is the source of French poulpe "octopus," and polyp was used in English from 1580s for "octopus, cuttlefish, eight- or ten-armed cephalopod," though this sense seems now to be obsolete.

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Definitions of polyp

polyp (n.)
a small vascular growth on the surface of a mucous membrane;
Synonyms: polypus
polyp (n.)
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;
in some species of coelenterate, polyps are a phase in the life cycle that alternates with a medusoid phase
From wordnet.princeton.edu