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parabolic reflector

n.
1.a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam

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    Idiom of the Day

    hazard a guess
    to make a guess
    I would not want to hazard a guess as to the age of the woman.



    1.
    I can't agree with ________ plan.

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    A praying mantis is an insect rather like a cricket, but up to 12 centimetres (5 inches) long. It can kill and eat small lizards and birds, holding them impaled on a special spike it has developed for the purpose. A really hungry mantis will eat its own babies.      .. More >>
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