Meaning of PHOTOELECTRIC CELL in English

PHOTOELECTRIC CELL

(also photo·cell ) noun

an electric device that uses a stream of light. When the stream is broken it shows that sb/sth is present, and can be used to control alarms, machinery, etc.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.