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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

    blow one's stack
    to become very angry
    The customer blew his stack when they refused to exchange his purchase at the store.



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    Jill: 'I hope nobody minds if I leave early.' Frank: ________

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