One of a pair of long flat runners of plastic, metal, or wood that curve upward in front and may be attached to a boot for gliding or traveling over snow.
A water ski.
Something that is used as a runner on a vehicle: a helicopter with skis for landing on snow and ice.
v.
skied, ski·ing, skis
v.
intr. To travel or glide on skis, especially as a sport. v.
tr. To travel or glide over on skis: ski a mountain slope.
[Norwegian, from Old Norse skīdh, stick, snowshoe; see skei- in Indo-European roots.] ski'a·ble adj., ski'er n.