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acoustic

[uh-koo-stik] /əˈku stɪk/
adjective, Also, acoustical
1.
pertaining to the sense or organs of hearing, to sound, or to the science of sound.
2.
(of a building material) designed for controlling sound.
3.
Music.
  1. of, pertaining to, or being a musical instrument whose sound is not electrically enhanced or modified.
  2. arranged for or made up of such instruments:
    an acoustic solo; an acoustic group.
noun
4.
Obsolete. a remedy for deafness or imperfect hearing.
Origin
1595-1605
1595-1605; < Greek akoustikós. See acouasm, -tic
Related forms
acoustically, adverb
nonacoustic, adjective, noun
nonacoustical, adjective
nonacoustically, adverb
unacoustic, adjective
unacoustical, adjective
unacoustically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unacoustical

acoustic

/əˈkuːstɪk/
adjective
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
Derived Forms
acoustically, adverb
Word Origin
C17: from Greek akoustikos, from akouein to hear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unacoustical

acoustic

adj.

c.1600, from French acoustique, from Greek akoustikos "pertaining to hearing," from akoustos "heard, audible," verbal adjective from akouein "to hear," probably from copulative prefix a- + koein "to mark, perceive, hear," from PIE *kous- "to hear," perhaps from root *(s)keu- "to notice, observe" (see caveat). Acoustic guitar (as opposed to electric) attested by 1958. Related: Acoustical; acoustically.

Online Etymology Dictionary, © 2010 Douglas Harper
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unacoustical in Medicine

acoustic a·cous·tic (ə-kōō'stĭk) or a·cous·ti·cal (-stĭ-kəl)
adj.
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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