1.
radar
A system that uses radio waves to detect the position, distance, and speed of objects. Used in aviation, meteorology, maritime navigation, and speed enforcement.
Borrowed from English "radar" (originally an acronym: Radio Detection And Ranging).
Common collocations
- レーダーに映る (to appear on radar)
- レーダーで探知する (to detect with radar)
- 気象レーダー (weather radar)
- 速度レーダー (speed radar)
- レーダー探知機 (radar detector)
Usage
In everyday Japanese, レーダー appears frequently in weather forecasts (雨雲レーダー — rain cloud radar) and in the context of speed enforcement (速度取り締まり} — speed checks). The figurative expression レーダーに引っかかる (to show up on someone's radar) is also used.