fourteenth (adj.)youdaoicibaDictYouDict[fourteenth 词源字典]
c. 1300, fourtenethe; see fourteen + -th (1). By influence of fourteen, replacing or modifying fourtende, fowrtethe, from Old English feowerteoða, Old Norse *feowertandi "fourteenth." Compare Dutch veertiende, German vierzehnte.[fourteenth etymology, fourteenth origin, 英语词源]