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aclinic line
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acoustic tile
a·cous·tic tile (plural a·cous·tic tiles)


noun 
Definition:
 
tile used to deaden sound: a ceiling or wall tile designed to stop or diminish the transmission of sound
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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