duckbill

noun10

1. •
   (informal) The duck-billed platypus.
2. •
   A kind of surgical mask with a trapezoid pouch-like design with shortened or absent side edges.
3. •
   A check valve with two or more flaps, usually shaped like a duck's beak, commonly used in medical applications to prevent contamination due to backflow.
4. •
   (informal) A hadrosaur.
5. •
   A modern and more streamlined and tighter fitting version of a flat cap.
6. •
   A device used to force padlocks.
7. •
   (US) Synonym of American paddlefish.
8. •
   A fish of the family Percophidae
9. •
   Percophis brasiliensis (Brazilian flathead).
10. •
    Bull ray (Aetomylaeus bovinus, now Pteromylaeus bovinus).