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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

    see red
    to become angry
    My friend saw red last night when I told him about the broken DVD player.



    1.
    My doctor says I should pack ___ smoking.

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    My Account / Test History
    Invention
    Invention : bar code
    Year : 1952
    Inventor : joseph woodland
    Country : us.      .. More >>
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