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    collimator

    collimator - Dictionary definition and meaning for word collimator

    Definition
    (noun) a small telescope attached to a large telescope to use in setting the line of the larger one Definition
    (noun) 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; light rays leave the slit as a parallel beam
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