nictitating membrane

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Definitions from WordNet

Noun nictitating membrane has 1 sense

nictitating membrane, third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammals
--₁ is a kind of protective fold
--₁ is a part of eye, oculus, optic
--₁ has particulars: haw

Definitions from the Web

Nictitating Membrane

Definition:

The nictitating membrane, also known as the third eyelid or haw, is a thin, translucent membrane that can be drawn across the eye for protection or moistening purposes in some animals.

Sample Sentences:

The bird's nictitating membrane closed rapidly to shield its eyes from dust and debris.
The amphibian uses its nictitating membrane to maintain moisture while underwater.
In certain predatory animals, such as cats, the nictitating membrane aids in protecting the eye during hunting.

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