What is the meaning of third eyelid?

noun

  • A protective fold of skin in the eyes of reptiles and birds and some mammals.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). third eyelid. Retrieved September 20, 2026, from http://smartdefine.org/third_eyelid/definitions/1315971
ChicagoWordNet. 2010. "third eyelid" http://smartdefine.org/third_eyelid/definitions/1315971 (accessed September 20, 2026).
HarvardWordNet 2010, third eyelid, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/third_eyelid/definitions/1315971>.
MLAWordNet. "third eyelid" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/third_eyelid/definitions/1315971>