The Collaborative International Dictionary of English v.0.48:
Piste \Piste\, n. [F., fr. L. pisere, pinsere, pistum, to pound.] (Min.) The track or tread a horseman makes upon the ground he goes over. --Johnson. [1913 Webster] PistelWordNet (r) 3.0 (2006):
piste n 1: a flat rectangular area for fencing bouts 2: a ski run densely packed with snow