COLLIMATOR - Definition

Pronunciation:		'kâlu`meytur
WordNet Dictionary

	Definition:	[n] 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 [n] a small telescope attached to a large telescope to use in setting the line of the larger one

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	See Also:	optical device, prism spectroscope, scope, spectroscope, telescope

Webster's 1913 Dictionary

	Definition:	\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.