collimator Meaning, Definition & Usage
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noun a small telescope attached to a large telescope to use in setting the line of the larger one
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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
WordNet
Col"li*ma`tor noun
Definitions
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(Astron.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal. Nichol. -
(Optics) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.
