sonar - WordReference.com Dictionary of English

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  - sommer
  - somnambulism
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  - somoni
  - son
  - son et lumière
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  - son-in-law
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sonar

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Concise Oxford English Dictionary © 2008 Oxford University Press:
sonar /ˈsəʊnɑː/

▶noun

1 a system for the detection of objects under water based on the emission and measured reflection of sound pulses.
■ an apparatus used for this.

2 the method of echolocation used in air or water by animals such as whales and bats.

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

'sonar' also found in these Oxford entries:

ASDIC - stealth

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