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diffraction grating

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

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  • diffraction
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  • difficulty
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  • difficultness
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  • difficult
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  • differently
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  • diffuse
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  • diffuse nebula
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  • diffusely
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  • diffuseness
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  • diffuser
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  • diffusing
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  • diffusion
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  • diffusion pump
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  • mourning cloak butterfly
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  • microfilm
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  • confab
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  • sandberry
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    Idiom of the Day

    turn of the century
    the end of one century and the beginning of another
    There were many large celebrations at the turn of the century.



    1.
    Choose an idiom to replace the expression in the brackets:
    The request by the employee is absolutely (impossible).

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