pandemic (adj.)youdaoicibaDictYouDict[pandemic 词源字典]
1660s, from Late Latin pandemus, from Greek pandemos "pertaining to all people; public, common," from pan- "all" (see pan-) + demos "people" (see demotic). Modeled on epidemic. The noun is first recorded 1853, from the adjective.[pandemic etymology, pandemic origin, 英语词源]