TICKTACKTOE

[tick.tack.toe] also tic-tac-toe n [tic-tac-toe, former game in which players with eyes shut brought a pencil down on a slate marked with numbers and scored the number hit] (ca. 1866): a game in which two players alternately put Xs and Os in compartments of a figure formed by two vertical lines crossing two horizontal lines and each tries to get a row of three Xs or three Os before the opponent does