roller
     n 1: a grounder that rolls along the infield
     2: a long heavy sea wave as it advances towards the shore [syn:
         {roll}, {rolling wave}]
     3: a small wheel without spokes (as on a roller skate)
     4: a cylinder that revolves
     5: a mechanical device consisting of a cylindrical tube around
        which the hair is wound to curl it; "a woman with her head
        full of curlers is not a pretty sight" [syn: {curler}, {hair
        curler}, {crimper}]
     6: Old World bird that tumbles or rolls in flight; related to
        kingfishers
     7: pigeon that executes backward somersaults in flight or on
        the ground [syn: {tumbler}, {tumbler pigeon}]
Source: WordNet® 2.0