Adjective
(music, of an electric instrument) Modified with a wholly or partially hollow soundbox, producing a sound similar to but different than a normal acoustic version of the same instrument.
Somewhat acoustic.
Source: en.wiktionary.orgHe later purchased a semi-acoustic electric guitar and amp, but he had to travel many miles to find an electrical outlet since his home had no electricity. Source: Internet
Whereas chambered guitars are made, like solid-body guitars, from a single block of wood, semi-acoustic and full-hollowbody guitars bodies are made from thin sheets of wood. Source: Internet
Rhythm guitarists who use arpeggio often favor semi-acoustic guitars and twelve string guitars to get bright, undistorted "jangly" sound. Source: Internet