a child's vehicle that typically has two wheels with a low footboard between them, is steered by a handlebar, and is propelled by pushing one foot against the ground while resting the other on the footboard.
Also calleda similar but larger and heavier vehicle for adults, having a saddlelike seat mounted on the footboard and being propelled by a motor.
(in the U.S. and Canada) a sailboat equipped with runners for use on ice.