- of, relating to, or denoting the last period of the Paleozoic era, between the Carboniferous and Triassic periods. See also Permo–Triassic.
The Permian lasted from about 290 million to 245 million years ago. The climate was hot and dry in many parts of the world during this period, which saw the extinction of many marine animals, including trilobites, and the proliferation of reptiles
late 16th century: from the name of the Russian province Perm, from the extensive development of such strata there