Definitions for duckbillˈdʌkˌbɪl
Random House Webster's College Dictionary
Ref: platypus .
Origin of duckbill:
paddlefish, duckbill, Polyodon spathula(noun)
primitive fish of the Mississippi valley having a long paddle-shaped snout
platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus(adj)
small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
having a beak resembling that of a duck
"a duck-billed dinosaur"
The duck-billed platypus.
see Duck mole, under Duck, n