a form of skate with four wheels or rollers instead of a runner, for use on a sidewalk or other surface offering traction.
roll•er-skatePronunciation: (rō'lur-skāt"), [key]
—v.i., -skat•ed, -skat•ing.
to glide about by means of roller skates. Also,roll'er•skate".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.