variants:
or less commonly flapper valve
Definition of flap valve
: a valve (as in a pump) composed of a disk hinged on one edge and swinging one way only
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share flap valve