二叠纪 èrdiéjì Permian Definitions Defs Origin Strokes Stroke Words Sentences Sents 二叠纪 二疊紀 èrdiéjì Permian The Permian period, the last geological period of the Paleozoic era; it occurred approximately 299 to 251 million years ago. Frequency Written text 0.183 per million Cross-References Referenced by 二叠系 èrdiéxìHas variant 二迭纪 èrdiéjì Sources Frequency data BCC Corpus (BLCU)
二叠纪 二疊紀 èrdiéjì Permian The Permian period, the last geological period of the Paleozoic era; it occurred approximately 299 to 251 million years ago. Frequency Written text 0.183 per million Cross-References Referenced by 二叠系 èrdiéxìHas variant 二迭纪 èrdiéjì Sources Frequency data BCC Corpus (BLCU)
