石炭纪 shítànjì Carboniferous Period Definitions Defs Origin Strokes Stroke Words Sentences Sents 石炭 shítàn coal (archaic) coal; anthracite; an ancient name for 煤 méi纪 紀 jì noun era (bound form) a period of time, such as a twelve-year cycle, a geological period, or a century; era
