二叠纪 èrdiéjì Permian Definitions Defs Origin Strokes Stroke Words Sentences Sents 二 èr numeral two the number two; 2叠 疊 dié verb to pile up To pile up or stack; to accumulate layer by layer纪 紀 jì noun era (bound form) a period of time, such as a twelve-year cycle, a geological period, or a century; era
