二に畳じょう紀きにじょうきMeanings1nounPermian periodGeological period name; used in academic and educational contexts. Cross-referenced with ペルム紀, which is the more common term.See also: ペルム紀二に畳じょう紀きは古こ生せい代だい最さい後ごの紀きである。The Permian period is the last period of the Paleozoic era.
