Etymology
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platypus (n.)

"Australian duck-mole," 1799, from Modern Latin, from Greek platypous, literally "flat-footed," from platys "broad, flat" (from PIE root *plat- "to spread") + pous "foot," from PIE root *ped- "foot." Originally the genus name, but entomologists had given it earlier to a genus of beetles; it was retained for the species after the genus name was changed in 1800 to Ornithorhyncus. OED has Australian platypussary (1945) "enclosure in which platypuses are kept."

updated on July 08, 2020

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Definitions of platypus from WordNet

platypus (n.)
small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae;
Synonyms: duckbill / duckbilled platypus / duck-billed platypus / Ornithorhynchus anatinus
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.