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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

    in a bind
    in trouble
    The couple will be in a bind if they cannot sell their house by next month.



    1.
    Unfortunately Icarus went too near the sun and the wax on his wings melted and the feathers worked ________ free and he fell on the ground and died.

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