Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water.
  • noun An apparatus, as one in a submarine, using sonar.
  • noun Echolocation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun nautical echolocation
  • noun nautical A device that uses hydrophones (in the same manner as radar) to locate objects underwater.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun 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

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[so(und) na(vigation and) r(anging).]

Examples

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  • SOund Navigation And Ranging

    February 28, 2007