- platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus - small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
--1 is a kind of monotreme, egg-laying mammal
--1 is a member of Ornithorhynchus, genus Ornithorhynchus