collimator

POS

Noun

HYPHEN

col=li=ma=tor

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CIDE DICTIONARY

collimator, n.

A telescope arranged and used to determine errors of collimation, both vertical and horizontal. Nichol. [1913 Webster]
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. [1913 Webster]

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OXFORD DICTIONARY

collimator, n.
1 a device for producing a parallel beam of rays or radiation.
2 a small fixed telescope used for adjusting the line of sight of an astronomical telescope, etc.

For further exploring for "collimator" in Webster Dictionary Online

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