Search Result for "anechoic": 
Wordnet 3.0

ADJECTIVE (1)

1. not having or producing echoes; sound-absorbent;
- Example: "an anechoic chamber"



WordNet (r) 3.0 (2006):

anechoic
    adj 1: not having or producing echoes; sound-absorbent; "an
           anechoic chamber"