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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

    ask for (something)
    to deserve something, to receive just punishment for something
    The boy is asking for some kind of punishment for what he is doing.



    1.
    Choose an idiom to replace the expression in the brackets:
    Our boss (was frank and honest) when he told us about the bankruptcy.

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    The underside of a horse's hoof is called a frog. The frog peels off several times a year with new growth.      .. More >>
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