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Nictitating membrane

noun

Definitions

Noun
  1. 1
    A transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals.

    "2015, Elizabeth Royte, Vultures Are Revolting. Here’s Why We Need to Save Them., National Geographic (December 2015)https://web.archive.org/web/20151213095110/http://ngm.nationalgeographic.com/2016/01/vultures-text As the wildebeest shrinks, the circle of sated birds lounging in the short grass expands. With bulging crops, the vultures settle their heads atop folded wings and slide their nictitating membranes shut."

  2. 2
    a protective fold of skin in the eyes of reptiles and birds and some mammals wordnet

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