Betwixt

1. предлог [устаревшее] между Синоним(ы): between 2. наречие [устаревшее]; то же, что и in betwixt между Синоним(ы): between

Большой англо-русский словарь

Betwixt

adverb or preposition Etymology: Middle English, from Old English betwux, from be- + -twux (akin to Gothic tweihnai two each) — more at between between

Merriam-Webster's Collegiate Dictionary