COLLIMATING
Verb
collimating
present participle of collimate
Adjective
collimating (comparative more collimating, superlative most collimating)
That collimates, or employs collimation
Source: Wiktionary
COLLIMATE
Col"li*mate, v. t. [imp. & p. p. Collimated; p. p. & vb. n.
Collimating.] Etym: [See Collimation.] (Physics & Astron.)
Definition: To render parallel to a certain line or direction; to bring
into the same line, as the axes of telescopes, etc.; to render
parallel, as rays of light.
Collimating eyepiece, an eyepiece with a diagonal reflector for
illumination, used to determine the error of collimation in a transit
instrument by observing the image of a cross wire reflected from
mercury, and comparing its position in the field with that of the
same wire seen directly.
– Collimating lens (Optics), a lens used for producing parallel
rays of light.
Source: Webster’s Unabridged Dictionary 1913 Edition