What is the meaning of roller?

noun

• A grounder that rolls along the infield.
• A long heavy sea wave as it advances towards the shore.
  • synonyms: roll, rolling wave
• A small wheel without spokes (as on a roller skate. )
• A cylinder that revolves.
• A mechanical device consisting of a cylindrical tube around which the hair is wound to curl it.
  • usage: "a woman with her head full of curlers is not a pretty sight"
  • synonyms: curler, hair curler, crimper
• Old World bird that tumbles or rolls in flight; related to kingfishers.
• Pigeon that executes backward somersaults in flight or on the ground.
  • synonyms: tumbler, tumbler pigeon