胡琴的一种，形状跟二胡相似，有四根弦。

sihu (or "khuurchir" in Mongolian), a bowed instrument with four strings, primarily associated with Mongolian and Chinese culture

a four-stringed instrument played with a bow

乐器名。形状与二胡相同，因有四条弦，故名。第一、第三两弦与第二、第四两弦同音。常用以伴奏大鼓等曲艺。