1841, "pertaining to the uppermost strata of the Paleozoic era," named by British geologist Sir Roderick Impey Murchison (1792-1871) for the region of Perm in northwestern Russia, where Murchison had studied rocks from this epoch. His original definition of the rock system was somewhat broader in each direction, chronologically, than the current one.
permeability
permeable
permeant
permeate
permeation
Permian
permissible
permission
permissive
permit
permutate
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