ski (n.) Look up ski at Dictionary.com
1885 (there is an isolated instance from 1755), from Norwegian ski, related to Old Norse skið "snowshoe," literally "stick of wood," cognate with Old English scid "stick of wood," obsolete English shide; Old High German skit, German Scheit "log," from Proto-Germanic *skid- "to divide, split," from PIE root *skei- "to cut, split" (see shed (v.)). The verb is 1893, from the noun. ski-jumper is from 1894; ski bum first attested 1960.