Acoustic

Adjective

 * 1) Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
 * 2)  Naturally producing or produced by an instrument without electrical amplification, as an acoustic guitar or acoustic piano.

Noun

 * 1)  A medicine or other agent to assist hearing.

Derived terms

 * acoustically
 * acoustics: the science of sound
 * acoustic duct: the auditory duct, or external passage of the ear.
 * acoustic guitar
 * acoustic telegraph: a telegraph making audible signals; a telephone, notably used on ships
 * acoustic vessels: brazen tubes or vessels, shaped like a bell, used in ancient theaters to propel the voices of the actors, so as to render them audible to a great distance.

Thesaurus
audible; audile; audio; auditory; aural; auricular; hearing; hypersonic; otic; otological; otopathic; otoscopic; phonic; sonic; subsonic; supersonic; transonic; transsonic; ultrasonic