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

sonar

noun
 
/ˈsəʊnɑː(r)/
 
/ˈsəʊnɑːr/
[uncountable]
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  1. equipment or a system for finding objects underwater using sound waves compare radar
    Oxford Collocations DictionarySonar is used before these nouns:
    • signal
    See full entry
    Word Origin1940s: from so(und) na(vigation and) r(anging), on the pattern of radar.
See sonar in the Oxford Advanced American Dictionary
Check pronunciation: sonar

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