"duckbill" in the noun sense
1. paddlefish, duckbill, Polyodon spathula
primitive fish of the Mississippi valley having a long paddle-shaped snout
2. 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
"duckbill" in the adjective sense
1. duckbill, duck-billed
having a beak resembling that of a duck
"a duck-billed dinosaur"
Source: WordNet® (An amazing lexical database of English)
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