实数集 shíshùjí set of real numbers Origin Definitions Defs Strokes Stroke Words Sentences Sents 实数 實數 shíshù real number (math.) The combination of all rational and irrational numbers, as opposed to an 虚数 xūshù集 jí noun [set] (abbreviation) a set of items with common properties in mathematics; short for 集合 jíhé