# photobeam

> English word · Noun

## Definitions
1. A beam of light whose interruption triggers a warning or a mechanism (such as a door).

## Etymology
From photo- + beam.

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