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# detector

«detector» in Mova's school dictionary: **a machine or device that notices or finds something, such…** — its meaning for a pupil, its sense in the lessons and examples, with 4 sentences of Mova's corpora that use it.

### part of speech

noun (detector, detectors)

### meaning for a pupil

A detector is a machine or device that notices or finds something, such as smoke, metal or movement. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#m1)

### sense in the lessons

In safety lessons, smoke detectors (smoke alarms) warn us of fire; test them regularly. In science, detectors measure things like light or heat. In everyday life: metal detectors at airports, carbon monoxide detectors at home. Phrases: «smoke detector», «metal detector», «motion detector», «lie detector».

### examples

- The smoke detector beeped when the toast burned. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x1)
- We found an old coin with a metal detector. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x2)
- Every home should have a working smoke detector. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x3)
- The motion detector switches on the garden light. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x4)
- At the airport we walked through a metal detector. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x5)
- Change the battery when the detector starts chirping. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x6)
- A carbon monoxide detector can save lives. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/#x7)

### note

From the verb «detect» (to notice or discover). Safety: a beeping or chirping detector means smoke or a low battery — tell an adult, never take out the battery to stop the noise. Countable: «a detector», «detectors».

### In the corpora

- [AI "detectors" exist, but they make mistakes and can wrongly accuse honest pupils.](https://md.mova.elamur.ai/free/en/corpora/school/ai/10-using-ai-to-learn-not-to-copy/6/)
- [AI detector tools are not always right and can wrongly accuse honest pupils.](https://md.mova.elamur.ai/free/en/corpora/school/ai/10-using-ai-to-learn-not-to-copy/14/)
- [It was reported that some students were wrongly accused of cheating by AI detectors; keeping drafts and notes helps show honest work.](https://md.mova.elamur.ai/free/en/corpora/school/ai/22-news-jobs-art-safety/16/)
- [Cameras and metal detectors check every item, and anything wrong is knocked off the line before it can reach a shop.](https://md.mova.elamur.ai/free/en/corpora/school/technology/1-how-a-factory-works/3/)

### Trees and pragmatics

[Every meaning and example of «detector» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/detector/), each sentence with its dependency tree and frames.