Antepenultimate

third from the end.
of or relating to an .
an .
historical examples

it lies between the penultimate and antepenultimate pair of legs.
the works of francis maitland balfour, volume 1 francis maitland balfour

on that place, if it be on the penultimate or antepenultimate, the accent should be laid in english.
notes and queries, number 216, december 17, 1853 various

even when the stress falls on this antepenultimate i, it is short in english speech.
society for pure english tract 4 john sargeaunt

only six thousand pounds now required for the great ultimate, or penultimate, or antepenultimate effort.
ireland as it is robert john buckley (aka r.j.b.)

b, toxicognaths of scolopendra, showing the large c-xal plate and the reduced penultimate and antepenultimate segments.
encyclopaedia britannica, 11th edition, volume 5, slice 6 various

it need hardly be said that ‘tea-houses’ like ‘grandfathers’ has the stress on the antepenultimate.
society for pure english tract 4 john sargeaunt

adjective
third from last
noun
anything that is third from last
adj.

“the last but two,” 1730, from antepenult (n.), 1610s, abbreviation of latin antepaenultima (syllaba), fem. of antepaenultimus, from ante “before” (see ante) + paenultima, from paen “almost” + ultima “last” (see ultimate).