Sonar
来自Big Physics
1940s: from so(und) na(vigation and) r(anging), on the pattern of radar .
wiktionary
From SONAR, acronym of sound navigation and ranging. Coined by American scientist Frederick Vinton Hunt in the 1940s.
etymonline
sonar (n.)
apparatus for detection underwater, 1946, from first letters of "sound navigation ranging," on pattern of radar.
