nictitating membrane

noun

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

First Known Use of nictitating membrane

1713, in the meaning defined above

Learn More About nictitating membrane

Time Traveler for nictitating membrane

Time Traveler

The first known use of nictitating membrane was in 1713

See more words from the same year

Dictionary Entries Near nictitating membrane

nictitate

nictitating membrane

nictitating spasm

See More Nearby Entries 

Statistics for nictitating membrane

Cite this Entry

“Nictitating membrane.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nictitating%20membrane. Accessed 30 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for nictitating membrane

nictitating membrane

noun

Medical Definition of nictitating membrane

: a thin membrane found in many vertebrate animals at the inner angle or beneath the lower lid of the eye and capable of extending across the eyeball

called also membrana nictitans, third eyelid

WORD OF THE DAY

Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!