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photocell

noun
🔊/ˈfəʊtəʊsel/
🔊/ˈfəʊtəʊsel/
(also photoelectric cell)
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  1. an electric device that uses a stream of light. When the stream is broken it shows that somebody/something is present, and can be used to control alarms, machines, etc.光电池；光电感应器；光电管Topics Engineeringc2