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diopter

n.
1.a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters

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    Idiom of the Day

    the silence is deafening
    the silence is so great that one becomes uncomfortable, the silence is so great that it suggests the disapproval of something
    The silence was deafening at the meeting when nobody stood up to challenge the speaker for his extreme remarks.



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