bn:00057645n
Noun Concept
Categories: Vertebrate anatomy, Eye
EN
nictitating membrane  third eyelid  Nictating membrane  haw  Inner eyelid
EN
A protective fold of skin in the eyes of reptiles and birds and some mammals WordNet 3.0
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EN
The nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision. Wikipedia
A transparent or translucent third eyelid on the eyes of some animals Wikipedia Disambiguation
A transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals. Wiktionary
Transparent protective fold of skin. Wiktionary (translation)
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