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# radar

«radar» in Mova's school dictionary: **a system that sends out radio waves and catches them when…** — its meaning for a pupil, its sense in the lessons and examples, with 3 sentences of Mova's corpora that use it.

### part of speech

noun (radar — uncountable; a radar)

### meaning for a pupil

1) Radar is a system that sends out radio waves and catches them when they bounce back, to find where planes, ships, storms or cars are and how fast they move. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#m1)

2) «On someone's radar» means they know about it or are paying attention to it. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#m2)

### sense in the lessons

In science radar shows how waves reflect; weather radar maps show rain clouds; police use radar to catch speeding cars; airports use it to guide planes. Bats and dolphins use a similar idea with sound (echolocation). Phrases: «on the radar», «under the radar», «weather radar», «radar screen».

### examples

- Air traffic controllers watch planes on the radar. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x1)
- The weather radar shows rain coming this afternoon. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x2)
- The police used radar to check the cars' speed. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x3)
- The ship's radar spotted an iceberg. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x4)
- Bats find insects in a way a bit like radar, using sound. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x5)
- The test is not on my radar yet — when is it? [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/radar/#x6)

### note

Usually uncountable («radar»), sometimes «a radar» for one machine. It reads the same backwards: r-a-d-a-r (a palindrome). It was first a short form of «RAdio Detection And Ranging». «Under the radar» means not noticed.

### In the corpora

- [A tornado warning means a tornado has been seen or found by radar, so you take shelter at once.](https://md.mova.elamur.ai/free/en/corpora/school/everyday/48-weather-emergencies/7/)
- [The real secret was radar, and the carrot story helped hide it.](https://md.mova.elamur.ai/free/en/corpora/school/myths/3-eyes-and-ears/1/)
- [In the Second World War, Britain spread the carrot story to help hide that its pilots used radar.](https://md.mova.elamur.ai/free/en/corpora/school/myths/3-eyes-and-ears/8/)

### Trees and pragmatics

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