sonic depth finder


a sonar instrument that uses echolocation to measure depths under water.

Words nearby sonic depth finder

Compare Fathometer.

Origin of sonic depth finder

First recorded in 1925–30
Also called echo sounder. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for echo sounder (1 of 2)

echo sounder


a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return

Derived forms of echo sounder

echo sounding, noun

British Dictionary definitions for echo sounder (2 of 2)

sonic depth finder


an instrument for detecting the depth of water or of a submerged object by means of sound waves; FathometerSee also sonar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012