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orthoboric acid

n.
1.a white or colorless slightly acid solid that is soluble in water and ethanol

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    Idiom of the Day

    peg away (at something)
    to keep working at something, to keep trying something
    My friend has been pegging away at his job for many years now.



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    My Account / Test History
    Invention
    Invention : calculator, electronic hand-held
    Year : 1967
    Inventor : jack s. kilby
    Country : us.      .. More >>
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