What does antepenult or antepenultima mean?
The definition of antepenult and antepenultima
An`te*pe”nult, An`te*pe*nult”i*ma, n.
Etym: [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.