Home › Words › P › purexpurexpurex means A chemical method used to purify fuel for nuclear reactors or nuclear weapons, based on liquid–liquid extraction ion-exchange.EtymologyShortening of plutonium uranium extraction.nounA chemical method used to purify fuel for nuclear reactors or nuclear weapons, based on liquid–liquid extraction ion-exchange.Definitions & examples from Wiktionary (CC BY-SA 3.0).