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Definition of: sonar
(sō′när) noun
1. A method of using underwater sound waves, at either audible or ultrasonic frequencies, for sounding, navigating, range finding, detection of submerged objects, communication, etc.
2. The equipment for accomplishing the transmission or reception of underwater sound waves.
—adjective Of, or pertaining to, the equipment, personnel, or methods employed in underwater acoustic signaling. [<SO(UND) NA(VIGATION AND) R(ANGING)]
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