third eyelid

/θərd ˌaɪˈlɪd/
IPA guide

Definitions of third eyelid
  1. noun
    a protective fold of skin in the eyes of reptiles and birds and some mammals
    synonyms: nictitating membrane
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    types:
    haw
    the nictitating membrane of a horse
    type of:
    protective fold
    a flap of tissue that protects what it covers
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