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collimator

n.
1.a small telescope attached to a large telescope to use in setting the line of the larger one
2.optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens

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    Idiom of the Day

    no deal
    not agreed to, no, certainly not
    It was no deal when my plan was rejected at the meeting.



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