Word Study
antepenultima
CIDE DICTIONARY
antepenultima, n. [L. antepaenultima (sc. syllaba) antepenultimate; ante before + paenultimus the last but one; paene almost + ultimus last.].
The last syllable of a word except two, as -syl- in monosyllable. [1913 Webster]
For further exploring for "antepenultima" in Webster Dictionary Online