pyrexia (n.)youdaoicibaDictYouDict[pyrexia 词源字典]
"fever," 1769, medical Latin, from Greek pyrexis "feverishness," from pyressein "to be feverish, to be ill of fever," from pyretos "fever, burning heat," related to pyr "fire," from PIE root *paəwr- "fire" (see fire (n.)) + abstract noun ending -ia.[pyrexia etymology, pyrexia origin, 英语词源]