稀有 xīyǒu rare Origin Definitions Defs Strokes Stroke Words Sentences Sents 稀有元素 xīyǒuyuánsù rare element (chemistry) rare element稀有气体 xīyǒuqìtǐ noble gas any of the chemically inert gaseous elements in Group 18 of the periodic table, such as helium or neon