anechoic

anechoic

[an-e-koh-ik]
adjective
(of a recording chamber, television studio, or the like) characterized by an unusually low degree of reverberation; echo-free.

Origin:
1945–50; an-1 + echoic

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World English Dictionary
anechoic (ˌænɪˈkəʊɪk)
 
adj
having a low degree of reverberation of sound: an anechoic recording studio

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

anechoic
1948, in electronics, from an- "not" + echoic (see echo)
Online Etymology Dictionary, © 2010 Douglas Harper
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