于 yúYú HSK2 at Definitions Defs Origin Strokes Stroke Words Sentences Sents Showing: question particle All meanings 391 yú 389 in 240to 133than 10by 4go 1question particle 1Yú 2 Yu 2 1 sentence for 于 (yú — question particle) 谁之永号?于? shéi zhī yǒng háo? yú? Whose long cry is it? Oh? Source: Dong Chinese Dictionary