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Pronunciation varies by accent · noun
A beam of light whose interruption triggers a warning or a mechanism (such as a door)..
Use photobeam when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photobeam means A beam of light whose interruption triggers a warning or a mechanism (such as a door)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photobeam where its definition matches the intended context.
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