# collimator

> English word · Noun

## Definitions
1. An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.
2. A similar device that produces a parallel beam of particles such as neutrons.
3. A small telescope attached to a larger one, used to point it in the correct general direction.

## Etymology
From collimate + -or.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/collimator