snow bike

Etymology

 * From being something akin to a two-wheeled motorcycle adapted for snow
 * From being something akin to a bicycle adapted to snow

Noun

 * 1) A mini-snowmobile built out of the frame of a motocross motorcycle (dirtbike), replacing the rear drive wheel with a long trailing caterpillar track and the front wheel with a single ski.
 * 2)  A bicycle frame with both the front and rear wheels replaced by skis

Derived terms

 * snowbiking