From Longman Dictionary of Contemporary Englishacrostica‧cros‧tic /əˈkrɒstɪk $ əˈkrɒː-/ noun [countable] ALDGOa poem or piece of writing in which the first or last letter of each line spells a wordOrigin acrostic (1500-1600) French acrostiche, from Greek akrostichis, from akr- ( → ACRONYM) + stichos “line”