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acid halide

n.
1.organic compounds containing the group -COX where X is a halogen atom

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    Idiom of the Day

    play second fiddle to (someone)
    to be second in importance to someone
    The man has been playing second fiddle to his boss for many years and has finally decided to change jobs.



    1.
    The Greek letter ________ is used in geometry to express the fixed ration of the circumference of a circle to its diameter.

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