Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
beam oflight whoseinterruption triggers awarning or amechanism (such as a door)
Etymologies
Sorry, no etymologies found.
Support
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Examples
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He passed through the photobeam and into the games parlor.
Starman's Quest Robert Silverberg
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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 Robert Silverberg
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