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sonar (n.)

apparatus for detection underwater, 1946, from first letters of "sound navigation ranging," on pattern of radar.

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Definitions of sonar from WordNet

sonar (n.)
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return;
sonar is an acronym for sound navigation ranging
Synonyms: echo sounder / asdic
From wordnet.princeton.edu

Dictionary entries near sonar

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