A ski's a long, flat device worn on the feet designed to help the wearer slide smoothly over snow. Originally intended as an aid to travel in snowy regions, they're now primarily used for recreational and sporting purposes. Also, a ski may denote a similar device used for other purposes than skiing, for example, for steering snowmobiles. History The original Nordic ski technology was adapted during the early twentieth century so that skiers could make turns at higher speeds. New ski and bindin… (More on Ski)