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optic cup

n.
1.(embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina

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    Idiom of the Day

    have second thoughts about (someone or something)
    to have doubts about someone or something
    Recently, I am having second thoughts about buying a new motorcycle.



    1.
    S1: The earliest reference to' the playing card has been found in China, as long ago, as the tenth century.
    S6: The current pack of 52 cards was only regulated in the seventeenth century.

    P: They appeared in Italy around 1320.
    Q: Long before that the Chinese used paper money which was similar in design to the playing cards.
    R: It is believed that perhaps travelling gypsies introduced them to Europe.
    S: In olden days cards were used both for telling fortune and playing games.

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