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Definition of Anechoic
1. Adjective. Not having or producing echoes; sound-absorbent. "An anechoic chamber"
Definition of Anechoic
1. neither having nor producing echoes [adj]
Medical Definition of Anechoic
1. The property of appearing echo-free or without echoes on a sonographic image; a clear cyst appears anechoic. See: transonic. Synonym: echo-free. Origin: G. An-priv. + echo + ic (05 Mar 2000)