恒星日 héngxīngrì sidereal day Origin Definitions Defs Strokes Stroke Words Sentences Sents 恒星 恆星 héngxīng noun star A celestial body of hot gas that generates its own light and heat, such as the sun; traditionally called a "fixed star" because its position relative to other stars appears constant.日 rì nounadverb day a 24-hour period; the time it takes for the earth to rotate once on its axis