/kol"euh may'teuhr/ , n.
1. Optics.
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.
[ 1815-25; COLLIMATE + -OR 2 ]