/ ˈrəʊlə(r); NAmE ˈroʊ-/ noun
a piece of wood, metal or plastic, shaped like a tube, that rolls over and over and is used in machines, for example to make sth flat, or to move sth :
the heavy steel rollers under the conveyor belt
(often in compounds) a machine or piece of equipment with a part shaped like a tube so that it rolls backwards and forwards. It may be used for making sth flat, crushing or spreading sth :
Flatten the surface of the grass with a roller.
a paint roller
—see also steamroller
a piece of wood or metal, shaped like a tube, that is used for moving heavy objects :
We'll need to move the piano on rollers.
a long, powerful wave in the sea / ocean :
Huge Atlantic rollers crashed onto the rocks.
a small plastic tube that hair is rolled around to give it curls
SYN curler :
Her hair was in rollers .
—see also high roller