ACOUSTIC
acoustic, acoustical
(adjective) of or relating to the science of acoustics; “acoustic properties of a hall”
acoustic
(noun) a remedy for hearing loss or deafness
Source: WordNet® 3.1
Etymology
Adjective
acoustic (not comparable)
Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
(music) Naturally producing or produced by an instrument without electrical amplification, as an acoustic guitar or acoustic piano.
Noun
acoustic (plural acoustics)
(medicine) A medicine or other agent to assist hearing.
Clipping of acoustic guitar.
Source: Wiktionary
A*cous"tic (#; 277), a. Etym: [F. acoustique, Gr.
Definition: Pertaining to the sense of hearing, the organs of hearing, or
the science of sounds; auditory. Acoustic duct, the auditory duct, or
external passage of the ear.
– Acoustic telegraph, a telegraph making audible signals; a
telephone.
– 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.
A*cous"tic, n.
Definition: A medicine or agent to assist hearing.
Source: Webster’s Unabridged Dictionary 1913 Edition