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English definition of “sonar”

sonar

noun [U]     /ˈsəʊ.nɑːr/ US  /ˈsoʊ.nɑːr/
equipment, especially on a ship, which uses sound waves to discover how deep the water is or the position of an object in the water, such as a group of fishNavigation and shipwrecks
(Definition of sonar noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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