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propionaldehyde

n.
1.a colorless liquid aldehyde

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    Idiom of the Day

    uptight
    to be worried or irritated or anxious
    My sister is very uptight because of her exams.



    1.
    The law was changed ________ the nineteenth century

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    Invention
    Invention : fresnel lens
    Year : 1820
    Inventor : augustin-jean fresnel
    Country : france.      .. More >>
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