Meaning of RADAR in English

RADAR

/ ˈreɪdɑː(r); NAmE / noun

[ U ] a system that uses radio waves to find the position and movement of objects, for example planes and ships, when they cannot be seen :

They located the ship by radar.

a radar screen

—compare sonar

IDIOMS

- on / off the radar screen

—more at bubble verb

••

WORD ORIGIN

1940s: from ra(dio) d(etection) a(nd) r(anging) .

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