adjective Also, acoustical.
pertaining to the sense or organs of hearing, to sound, or to the science of sound.
(of a building material) designed for controlling sound.
of, pertaining to, or being a musical instrument whose sound is not electrically enhanced or modified.
arranged for or made up of such instruments: an acoustic solo; an acoustic group.
Obsolete. a remedy for deafness or imperfect hearing.

1595–1605; < Greek akoustikós. See acouasm, -tic

acoustically, adverb
nonacoustic, adjective, noun
nonacoustical, adjective
nonacoustically, adverb
unacoustic, adjective
unacoustical, adjective
unacoustically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acoustic or acoustical (əˈkuːstɪk)
1.  of or related to sound, the sense of hearing, or acoustics
2.  designed to respond to, absorb, or control sound: an acoustic tile
3.  (of a musical instrument or recording) without electronic amplification: an acoustic bass; an acoustic guitar
[C17: from Greek akoustikos, from akouein to hear]
acoustical or acoustical
[C17: from Greek akoustikos, from akouein to hear]
a'coustically or acoustical

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1600, from Fr. acoustique, from Gk. akoustikos "pertaining to hearing," from akoustos "heard, audible," from akouein "to hear," from copulative prefix a- + koein "to mark, perceive, hear," from PIE base *(s)keu- "to notice, observe" (see caveat). Acoustic guitar (as opposed
to electric) attested by 1958.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acoustic a·cous·tic (ə-kōō'stĭk) or a·cous·ti·cal (-stĭ-kəl)
Of or relating to sound, the sense of hearing, or the perception of sound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Normally when sound enters the ear, acoustic information is relayed from the
  ear to the brain via nerve cells, called neurons.
The interior is coated with sound-isolating open-cell acoustic foam.
The listener is not able to understand where the acoustic instrument is and
  where the new sampled sound comes in.
Acoustic neuromas can be observed, or treated with surgery or radiation.
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