Anechoic Definition

ănĕ-kōĭk

adjective

Neither having nor producing echoes.

An anechoic chamber.

American Heritage

Free from echoes; completely absorbing sound or radar waves.

An anechoic chamber.

Webster's New World

(acoustics) Lacking echos; that absorbs sound.

The bassoonist settled into the anechoic chamber and prepared for another grueling recording session.

Wiktionary

Origin of Anechoic

From an- +‎ echoic, from echo +‎ -ic, from Middle English ecco, ekko, from Medieval Latin ecco, from Latin echo, from Ancient Greek ἠχώ (ēkhō), from ἠχή (ēkhē, “sound”).

From Wiktionary

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