pestilence (n.)youdaoicibaDictYouDict[pestilence 词源字典]
c. 1300, from Old French pestilence "plague, epidemic" (12c.) and directly from Latin pestilentia "a plague, an unwholesome atmosphere," noun of condition from pestilentem (nominative pestilens) "infected, unwholesome, noxious," from pestis "deadly disease, plague" (see pest).[pestilence etymology, pestilence origin, 英语词源]