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acoustic

a·cous·tic [ ə kstik ] or a·cous·ti·cal [ ə kstik ]


adjective 
Definition:
 
1. of sound: relating to sound, hearing, or the study of sound

2. designed for use with sound: designed to control, absorb, or carry sound

3. music not amplified: describes music or a musical instrument that is not electronically amplified, e.g. a guitar



noun  (plural a·cous·tics) (plural a·cous·ti·cals)
Definition:
 
1. musical instrument without amplification: a musical instrument that is not electronically amplified, usually a guitar ( informal )

2. music 
Same as  acousticsnpl


[Early 18th century. < Greek akoustikos< akouein "hear" < Indo-European]

a·cous·ti·cal·ly adverb
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