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anechoicA term used to refer to an ultrasonic wave that is transmitted into tissue without it being reflected back.
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anechoic1948, in electronics, from an- (1) "not" + echoic.
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anechoic1. The complete absence of reflected sound (echo). 2. An environment that prevents (through dissipation and absorption of sound waves) all reflected sound, as in an anechoic chamber.
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anechoic(adj) not having or producing echoes; sound-absorbent
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anechoicfree from echoes and reverberations. Literally, non-echoing.
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anechoicThe property of appearing echo-free or without echoes on a sonographic image; a clear cyst appears anechoic. See: transonic. Synonyms: echo-free. Origin: G. An-priv. + echo + ic (05 Mar 2000)
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