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nouna small telescope attached to a large telescope to use in setting the line of the larger one
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nounoptical 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 beamtype of:part of:
Antonyms of collimator
We don't have antonyms for this word yet.