ANTEPENULT

[an.te.pe.nult] also an.te.pen.ul.ti.ma n [LL antepaenultima, fem. of antepaenultimus preceding the next to last, fr. L ante- + paenultimus penultimate] (1581): the third syllable of a word counting from the end (as cu in accumulate) -- an.te.pen.ul.ti.mate adj or n