有理数域 yǒulǐshùyù field of rational numbers Origin Definitions Defs Strokes Stroke Words Sentences Sents 有理数 有理數 yǒulǐshù rational number a number that can be expressed as a fraction of two integers; includes all integers, fractions, and terminating or repeating decimals域 yù noun field (bound form) a field of activity or scope of knowledge; a figurative range or domain