1a cylinder that rotates about a central axis and is used in various machines and devices to move, flatten, or spread something:the sheets moved through rollers and down the folding machineuse a roller to resettle turf laid during autumn and winter
an absorbent revolving cylinder attached to a handle, used to apply paint:further coats can be applied by brush or roller
a small cylinder around which hair is rolled in order to produce curls:it’s best to put rollers in when hair is slightly damp after washing
(also roller bandage) a long surgical bandage rolled up for convenient application.
2a long swelling wave that appears to roll steadily towards the shore:the Atlantic rollers
3 [as modifier] relating to or involving roller skates:roller hockey
4a brightly coloured crow-sized bird with predominantly blue plumage, having a characteristic tumbling display flight.
Genera Coracias and Eurystomus, family Coraciidae: several species, especially the widespread European roller (C. garrulus)