anechoic

[an-e-koh-ik]
adjective
  1. (of a recording chamber, television studio, or the like) characterized by an unusually low degree of reverberation; echo-free.

Origin of anechoic

First recorded in 1945–50; an-1 + echoic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for anechoic

anechoic

adjective
  1. having a low degree of reverberation of soundan anechoic recording studio
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

Word Origin and History for anechoic
adj.

1948, in electronics, from an- (1) "not" + echoic.

Online Etymology Dictionary, © 2010 Douglas Harper