WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. sonar, echo sounder, asdic, measuring instrument, measuring system, measuring device, navigational instrument
- usage: 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"; "asdic is an acronym for antisubmarine detection investigation committee"
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See also: sonar (Dictionary)