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anacoustic

[an-uh-koo-stik] /ˌæn əˈku stɪk/
adjective
1.
of or relating to the upper portion of the earth's atmosphere and to interplanetary space, where sound cannot be transmitted because molecules are too far apart to serve as a transmitting medium.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anacoustic

anacoustic

/ˌænəˈkuːstɪk/
adjective
1.
unable to support the propagation of sound; soundless
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
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