Definition of sonar noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsəʊnɑː(r)//
; NAmE NAmE//ˈsoʊnɑːr//
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equipment or a system for finding objects underwater using sound waves compare radar Word Origin 1940s: from so(und) na(vigation and) r(anging), on the pattern of radar.
See the Oxford Advanced American Dictionary entry: sonar