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anacoustic

American

[an-uh-koo-stik] / ˌæn əˈku stɪk /

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.

anacoustic British

/ 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

Etymology

Origin of anacoustic

an- ¹ + acoustic

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023