from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A beam of light whose interruption triggers a warning or a mechanism (such as a door)


Sorry, no etymologies found.


  • He passed through the photobeam and into the games parlor.

    Starman's Quest

  • Alan followed him through a gate that had once been imposing; now it swung open rather rustily as they broke the photobeam in front of it.

    Starman's Quest


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