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echolocation

[ek-oh-loh-key-shuhn]

Origin

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noun

the general method of locating objects by determining the time for an echo to return and the direction from which it returns, as by radar or sonar.

Zoology. the sonarlike system used by dolphins, bats, and other animals to detect and locate objects by emitting usually high-pitched sounds that reflect off the object and return to the animal's ears or other sensory receptors.

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Origin:
1944; echo + location

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Echolocation is always a great word to know.

So is mollusca. Does it mean:

major grouping of small-to-microscopic pseudocoelomate organisms

phylum comprised of mollusks

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Collins

World English Dictionary

echolocation (ˌɛkəʊləʊˈkeɪʃən)

—n
	determination of the position of an object by measuring the time taken for an echo to return from it and its direction

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

echolocation

1944, from echo + location.

American Heritage

Science Dictionary

echolocation

(ěk'ō-lō-kā'shən) Pronunciation Key
Sonar, especially of animals, such as bats and toothed whales. See more at sonar.