permian
adjective
1. Pertaining tp the Perm region of Russia, or its inhabitants. [from 18th c.]
2. Pertaining to their language; Permic. [from 18th c.]
3. (geology) Pertaining to the last geologic period of the Paleozoic era; comprising the Cisuralian, Guadalupian and Lopingian epochs from about 280 to 248 million years ago. [from 19th c.]