Definition of nictitating membrane
: a thin membrane found in many vertebrates at the inner angle or beneath the lower lid of the eye and capable of extending across the eyeball
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
February 2021 Words of the Day Quiz
-
- Which is a synonym of perdure?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Anagram puzzles meet word search.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
Share nictitating membrane
Time Traveler for nictitating membrane
The first known use of nictitating membrane was in 1713
See more words from the same year