The Collaborative International Dictionary
Antepenultima
Antepenult \An`te*pe"nult\, ||Antepenultima \An`te*pe*nult"i*ma\, n. [L. antepaenultima (sc. syllaba) antepenultimate; ante before + paenultimus the last but one; paene almost + ultimus last.] (Pros.) The last syllable of a word except two, as -syl- in monosyllable.
Wiktionary
antepenultima
n. (context poetry English) The last syllable of a word except two