A cylindrical object that spins or rotates, used for flattening, smoothing, moving, or applying substances like paint or ink.
From 'roll' (to turn over and over, from Old French 'rolle,' Latin 'rotula' meaning 'small wheel'), plus agent suffix '-er' meaning something that performs the action of rolling.
A roller is basically a wheel reinvented for different purposes—paint rollers, hair rollers, roller coasters—but they all do the same thing: turn round and round to either smooth, shape, or move something!
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