pyretic (adj.)youdaoicibaDictYouDict[pyretic 词源字典]
1809, from French pyrétique or directly from Modern Latin pyreticus, from Greek pyretos "fever, burning heat," related to pyr "fire," from PIE root *paəwr- "fire" (see fire (n.)). As a noun, "a pyretic agent," from 1728.[pyretic etymology, pyretic origin, 英语词源]