anacoustic

anacoustic

[an-uh-koo-stik]
adjective
of or pertaining 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.

Origin:
an-1 + acoustic

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World English Dictionary
anacoustic (ˌænəˈkuːstɪk)
 
adj
unable to support the propagation of sound; soundless

Collins English Dictionary - Complete & Unabridged 10th Edition
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