Real Dictionary

skateboard
countable noun: A skateboard is a narrow board with wheels at each end, which people stand on and ride for pleasure.

skateboard in American English
a toy consisting of a short, oblong board with a pair of small wheels at each end, ridden, as down an incline, usually in a standing position
to ride or coast on a skateboard
intransitive verb: to ride a skateboard
noun: a device for riding upon, usually while standing, consisting of a short, oblong piece of wood, plastic, or aluminum mounted on large roller-skate wheels, used on smooth surfaces and requiring better balance of the rider than a roller skate does

skateboard in British English
noun: a narrow board mounted on roller-skate wheels, usually ridden while standing up
verb: to ride on a skateboard