antepenultimate (adj.)youdaoicibaDictYouDict[antepenultimate 词源字典]
"the last but two," 1730, from antepenult (n.), 1610s, abbreviation of Latin antepaenultima (syllaba), fem. of antepaenultimus, from ante "before" (see ante) + paenultima, from paen "almost" + ultima "last" (see ultimate).[antepenultimate etymology, antepenultimate origin, 英语词源]