Yuzu (Citrus junos, from Japanese ユズ or 柚子) is a citrus fruit and plant in the family Rutaceae. It is believed to have originated in central China as a hybrid of mandarin orange and the ichang papeda.
The yuzu is called yuja (from Korean 유자) in Korean cuisine. Both Japanese yuzu and Korean yuja are borrowings of the Chinese yòuzi (柚子), though this Chinese word now refers to the pomelo.