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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

    on (someone's) account
    because of someone
    We went to the children's festival on our daughter's account.



    1.
    Now that she is living in her own flat, (a) / she cleans the windows, (b) / twice a week in the summer and once a week in the winter. (c) / No error (d)

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    The smallest bone in the human body is the stapes or stirrup bone located in the middle ear. It is approximately .11 inches (.28 cm) long.      .. More >>
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