nic·ti·tat·ing membrane (n k t-t  tng) also nic·tat·ing membrane (nkttng)n. A transparent inner eyelid in birds, reptiles, and some mammals that closes to protect and moisten the eye. Also called third eyelid. |
nictitating membrane
n
(Life Sciences & Allied Applications / Zoology) (in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eye Also called third eyelid haw
| nictitating membrane (nkt-ttng) A transparent inner eyelid in birds, reptiles, amphibians, and some mammals that protects and moistens the eye without blocking vision. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  nictitating membrane - a protective fold of skin in the eyes of reptiles and birds and some mammalsprotective fold - a flap of tissue that protects what it covers haw - the nictitating membrane of a horse |
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