collimator : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: collimator	by the DICT Development Group
2 results for collimator
From WordNet (r) 3.0 (2006) [wn]:
collimator n a small telescope attached to a large telescope to use in setting the line of the larger one 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
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Collimator \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.