Cylindrical objects that rotate to move, flatten, or apply something; large ocean waves; devices used in hairdressing to create curls.
From 'roll' (Old French 'roler') plus agent suffix '-er'. The word developed multiple meanings as rolling mechanisms were applied to various purposes from transportation to beauty.
Hair rollers were invented by accident in 1930 when a woman left metal clips in her hair too long. The resulting curls were so admired that she patented the design, revolutionizing hairstyling and creating a billion-dollar industry.
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