Etymology
Borrowed from Middle French acrostiche, acrostique (“acrostic”) (modern French acrostiche), and its etymon Late Latin acrostichis, from Ancient Greek ἀκροστιχίς (akrostikhís), from ἄκρο- (ákro-, prefix indicating, among other things, the extremity or tip of something) + στῐ́χος (stĭ́khos, “row or file of soldiers; line of poetry, verse”) (ultimately from Proto-Indo-European *steygʰ- (“to climb, go”)).