司天监 sītiānjiàn Bureau of Astronomy Origin Definitions Defs Strokes Stroke Words Sentences Sents 司 sī noun to take charge of (bound form) to take charge of; to manage; to attend to; to operate天 tiān noun sky sky; heavens; the space above the earth监 監 jiàn (bound form) government office (bound form) a name for certain government offices or supervisory departments in imperial China