roll·er 
/ˈroʊlɚ/ noun
plural roll·ers /ˈroʊlɚ/ noun [count] 1 a : a part that rolls and is used to move, press, shape, spread, or smooth something
▪ the rollers of a conveyor belt ▪ They moved the monument on rollers. ▪ He flattened the clay with a roller. ▪ a paint roller — see also steamroller
b : a cylinder or rod on which something (such as a window shade or a map) is rolled up 2 : a small plastic or metal tube around which hair is wrapped to make it curl
▪ Her hair was in rollers. [=curlers] 3 : a long, powerful ocean wave 4 : a ball that rolls slowly along the ground
▪ (baseball) He hit a slow roller to the shortstop.
▪ the rollers of a conveyor belt ▪ They moved the monument on rollers. ▪ He flattened the clay with a roller. ▪ a paint roller — see also steamroller
b : a cylinder or rod on which something (such as a window shade or a map) is rolled up
▪ Her hair was in rollers. [=curlers]
▪ (baseball) He hit a slow roller to the shortstop.
— see also high roller
