# duckbill

> English word · Noun

## Definitions
1. The duck-billed platypus.
2. A hadrosaur.
3. A fish of the family Percophidae
4. A fish of the family Percophidae
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

## Etymology
From duck + bill.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/duckbill