nictitating membrane


noun

a thin membrane, or inner or third eyelid, present in many animals, capable of being drawn across the eyeball, as for protection.

Nearby words

  1. nicoya,
  2. nicoya peninsula,
  3. nicoya, gulf of,
  4. nictheroy,
  5. nictitate,
  6. nictitation,
  7. nicu,
  8. nid-nod,
  9. nida,
  10. nidal

Origin of nictitating membrane

1705–15; nictate + -ing2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for nictitating membrane

nictitating membrane

/ (ˈnɪktɪˌteɪtɪŋ) /

noun

(in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eyeAlso called: third eyelid, haw
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for nictitating membrane

nictitating membrane

[ nĭktĭ-tā′tĭng ]

A transparent inner eyelid in birds, reptiles, amphibians, and some mammals that protects and moistens the eye without blocking vision.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.