duckbill
noun
RareNot in standard dictionaries
1
The duck-billed platypus.
2
A hadrosaur.
3
A fish of the family Percophidae
4
Percophis brasiliensis (Brazilian flathead).
5
Bull ray (Aetomylaeus bovinus, now Pteromylaeus bovinus).
6
A device used to force padlocks.
7
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.
8
A kind of surgical mask with a trapezoid pouch-like design with shortened or absent side edges.
9
A modern and more streamlined and tighter fitting version of a flat cap
#informal