/ˈrezɪdju:; US -du: ||; ˈrɛzəˌdu/noun [C] [usu.sing] (formal 正式) what is left after the main part of sth is taken or used 剩余物；残渣: The washing powder left a white residue on the clothes. 洗衣粉在衣服上留下白色残渣。