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diffraction grating

n.
1.optical device consisting of a surface with many parallel grooves in it

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Word of the Day

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  • diffraction
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    Idiom of the Day

    what's (up) with (someone)
    what is happening or wrong with someone, how is everything with someone
    "What`s up with the new supervisor? He seems very angry this morning."



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    Sycophantic

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