antepenultimate
noun
Definitions
Two before the last in a series. e.g. (..., antepenultimate, penultimate, ultimate)
The syllable that comes two before the last in a word.
Example: The words animal, citizen, comedy, dangerous, obvious, and antepenultimate are stressed on the antepenultimate.
adjective
Definitions
Two before the last, i.e., the one immediately before the penultimate, in a series.
Example: This book has ten chapters — chapter 8 is the antepenultimate one.