detector

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de|tec|tor /dɪt'ektər/ (detectors)
[N-COUNT] oft n N
A detector is an instrument which is used to discover that something is present somewhere, or to measure how much of something there is.
...a metal detector.
...fire alarms and smoke detectors.lie de|tec|tor (lie detectors)
[N-COUNT] oft N n
A lie detector is an electronic machine used mainly by the police to find out whether a suspect is telling the truth.
...the results of a lie detector test.
= polygraph

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