The transparent membrane (third eyelid) that moistens the eye and protects it from dust while maintaining some level of vision. This membrane is found in many amphibians, birds, reptiles, sharks, and some mammals.
Nictitating Membrane
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The transparent membrane (third eyelid) that moistens the eye and protects it from dust while maintaining some level of vision. This membrane is found in many amphibians, birds, reptiles, sharks, and some mammals.