rejuvenescence (n.)youdaoicibaDictYouDict[rejuvenescence 词源字典]
"renewal of youth," 1630s, from Latin rejuvenescere, from re- "again" (see re-) + juvenescere "become young," from juvenis "young" (see young (adj.)) + -ence.[rejuvenescence etymology, rejuvenescence origin, 英语词源]