Etymology
Advertisement

sonar (n.)

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

Advertisement
Advertisement
Definitions of sonar

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