Webster's English Dictionary

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acoustic

acous.tic \*-'ku:-stik\ \-sti-k*l\ \-k(*)le-\ aj [Gk akoustikos of hearing, 
   fr. akouein to hear - more at HEAR)M : of or relating to the sense or 
   organs of hearing, to sound, or to the science of sounds : as : deadening 
   sound  : operated by or utilizing sound waves  - acous.ti.cal aj