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refractivity

n.
1.the physical property of a medium as determined by its index of refraction

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  • Idiom of the Day

    on the hour
    exactly on the hour mark (12:00, 1:00 etc.)
    My grandmother must take her medicine on the hour.



    1.
    A charming painting of a pleasant ________ landscape hung above Vitaly’s fireplace, in marked contrast to the noise and lights of the bustling city outside his window.

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    The leaning tower of pisa, one of italy's greatest tourist attractions, leans in a southerly direction.      .. More >>
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