sonar Hear it!

sonar definition

so·nar (sō′när′)

noun

an apparatus that transmits high-frequency sound waves through water and registers the vibrations reflected from an object, used in finding submarines, depths, etc.

Etymology: so(und) n(avigation) a(nd) r(anging)

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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