Pronunciation: (kol'u-mā"tur), [key]
a. a fixed telescope for use in collimating other instruments.
b. an optical system that transmits parallel rays of light, as the receiving lens or telescope of a spectroscope.
2. Physics.a device for producing a beam of particles in which the paths of all the particles are parallel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.