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  • word of the day

    nictitating membrane

    nictitating membrane - 365bet中国官方网站 definition and meaning for word nictitating membrane

    Definition
    (noun) a protective fold of skin in the eyes of reptiles and birds and some mammals
    Synonyms : third eyelid

  • Word used in video below:
    text: So while an animal cell has a membrane,
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