出典:Wiktionary
Retronym for guitar, coined after the invention of the electric guitar to refer to the older type of guitar and avoid confusion with the electric guitar.
acoustic guitar (複数形 acoustic guitars)
(電気で増幅してない)生(なま)ギ ター, アコースティックギター.
an acoustic guitar
ギターをひく
弦楽器の
a {Japanese harp}
string-instruments
ギターをひく.