noun, plural skis, ski, verb, skied, ski⋅ing.| 1. | one of a pair of long, slender runners made of wood, plastic, or metal used in gliding over snow. |
| 2. | water ski. |
| 3. | to travel on skis, as for sport. |
| 4. | to use skis on; travel on skis over: to ski the slopes of Switzerland. |
