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paraboloid

n.
1.a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis

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    Idiom of the Day

    upper hand
    a controlling power, an advantage
    The union members have the upper hand in their negotiations with the company.



    1.
    The crew were on board (a) / and they soon busied themselves (b) in preparing to meet the storm. (c) No error (d)

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