#roller.cylinder  a cylinder that revolves
  supertype:  cylinder.solid  a solid bounded by a cylindrical surface and two parallel planes (the bases)
  part of:  roller_blind
  subtype:  garden_roller  heavy cast-iron cylinder used to flatten lawns
  subtype:  paint_roller__paintroller  a roller that has an absorbent surface used for spreading paint
  subtype:  platen  the roller on a typewriter against which the keys strike
  subtype:  sprocket  roller that has teeth on the rims to pull film or paper through
  subtype:  trundle  small wheel or roller

No statement uses or specializes roller.cylinder; click here to add one.