Col"li*ma`tor (?), n.
1. Astron.
A telescope arranged and used to determine errors of collimation, both vertical and horizontal.
Nichol.
2. 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.
© Webster 1913.