[acros.tic] n [MF & Gk; MF acrostiche, fr. Gk akrostichis, fr. akr- acr- + stichos line; akin to steichein to go--more at stair] (1530) 1: a composition usu. in verse in which sets of letters (as the initial or final letters of the lines) taken in order form a word or phrase or a regular sequence of letters of the alphabet
2: acronym -- acrostic also acros.ti.cal adj -- acros.ti.cal.ly adv