stringed instrument

musical instrument whose sounds are created via strumming or plucking on their strings

A string instrument (or stringed instrument) is a musical instrument that produces sound by means of vibrating strings. In the Hornbostel-Sachs scheme of musical instrument classification, used in organology, they are called chordophones. The most common string instruments in Western music are those in the violin, piano and guitar families.
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Noun
1. a musical instrument in which taut strings provide the source of sound
(hypernym) musical instrument, instrument
(hyponym) banjo
(part-meronym) bridge

stringed instrument
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n. เครื่องดนตรีประเภทสาย (syn. fiddle)