sonar

Use Sonar in a sentence

noun

a method for detecting and locating objects submerged in water by echolocation.

the apparatus used in sonar.

Also called, British, asdic.

Origin:
1940–45; so(und) na(vigation) r(anging)

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins

World English Dictionary

sonar (ˈsəʊnɑː)

—n
	a communication and position-finding device used in underwater navigation and target detection using echolocation

[C20: from so(und) na(vigation and) r(anging)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Sonar is always a great word to know.

So is zedonk. Does it mean:

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

the offspring of a zebra and a donkey.

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Etymonline

Word Origin & History

sonar

1946, from first letters of "sound navigation ranging," on pattern of radar.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Science Dictionary

sonar

(sō'när') Pronunciation Key

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Short for sound navigation and ranging. A method of detecting, locating, and determining the speed of objects through the use of reflected sound waves. A sound signal is produced, and the time it takes for the signal to reach an object and for its echo to return is used to calculate the object's distance. The Doppler effect can also be used to determine the object's relative velocity. Electronic sonar systems are used for submarine navigation and for detecting schools of fish. Some mammals, especially bats, use biological sonar to navigate and detect prey in dark conditions, commonly called echolocation.
The equipment or physiology used in doing this. See also Doppler effect , lidar , radar.