Permian
adjective geology specialized uk/ˈpɜːmi.ən/ /ˈpɝːmi.ən/
二叠纪（迄今2亿9000万至2亿3000万年前，其间出现大型爬行动物和两栖动物，大部分物种在这期间的最后灭绝）
from or referring to the period of time between about 290 and 250 million years ago, in which large reptiles and amphibians appeared, and that ended with most species on earth becoming extinct (= dying out completely)
the Permian period 二叠纪
Permian rocks 二叠纪岩石
the Permian
noun [ S ]
二叠纪
the Permian period