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noun (plural platypuses)
- a semiaquatic egg-laying mammal which frequents lakes and streams in eastern Australia. It has a sensitive pliable bill shaped like that of a duck, webbed feet with venomous spurs, and dense fur. Also called duckbill or duck-billed platypus.
- Ornithorhynchus anatinus, the only member of the family Ornithorhynchidae, order Monotremata
late 18th century: modern Latin, from Greek platupous 'flat-footed', from platus 'flat' + pous 'foot'