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anacoustic

[ an-uh-koo-stik ]
/ ˌæn əˈku stɪk /
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adjective
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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Origin of anacoustic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

British Dictionary definitions for anacoustic

anacoustic
/ (ˌænəˈkuːstɪk) /

adjective
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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