SONAR


Meaning of SONAR in English

/ ˈsəʊnɑː(r); NAmE ˈsoʊ-/ noun

[ U ] equipment or a system for finding objects underwater using sound waves

—compare radar

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WORD ORIGIN

1940s: from so(und) na(vigation and) r(anging) , on the pattern of radar .

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