roller ski1
/ˈrəʊlə ˌskiː/noun
Each of a pair of (usually small) skis, fitted with a small wheel at each end, and used for skiing on tarmac, grass, and other dry surfaces.
Origin
1930s; earliest use found in Popular Science Monthly. From roller + ski.
roller ski2
/ˈrəʊlə ˌskiː/verb
[no object] To ski on roller skis.
Origin
1970s; earliest use found in Skiing. From roller ski.