from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A device for measuring depth of water by sending pressure waves down from the surface and recording the time until the echo returns from the bottom.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
sonardevice used for echo sounding
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
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