roller Definition in Cambridge British English Dictionary
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Definition of "roller" - British English Dictionary

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rollernoun

uk   /ˈrəʊ.lər/  us   /ˈroʊ.lɚ/

roller noun (MACHINE/DEVICE)

[C] a tube-shaped object in a machine that turns over and over in order to carry things along or press them down or together: As the hot metal passed between the huge rollers it was pressed into thin sheets. [C usually plural] a tube-shaped device, often heated, that women use to curl their hair: She answered the door with her rollers in. [C] a heavy machine used to make surfaces smooth and flat: The men used a roller to flatten the tarmac.
See also

roller noun (WAVE)

[C] a large, long wave on the sea
(Definition of roller from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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