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  1. Oxford American Dictionary

    nictitating membrane

    • IPA[ˌniktətādiNG ˈmembrān]

    美式

    • n.
      a whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. It can be drawn across the eye to protect it from dust and keep it moist.

    • noun: nictitating membrane, plural noun: nictitating membranes