noun
bowed string instrument
Technical music term covering instruments played with a bow, such as the violin, cello, and erhu.
バイオリンは擦弦楽器の一種です。
The violin is a type of bowed string instrument.
弦楽器 is a broader term for all string instruments, including plucked and struck strings, while 擦弦楽器 specifically refers to bowed strings.
Compound of 擦 (satsu, 'rub, friction') + 弦 (gen, 'string') + 楽器 (gakki, 'musical instrument'). The reading さつげん is a regular on'yomi combination.