Plural of hairdryer; electrical devices that blow hot air to dry and style wet hair.
From 'hair' (Old English 'hær') + 'dry' (Old English 'dryge') + 'er' (agent suffix). The hairdryer as an electrical appliance emerged in the early 1900s, revolutionizing personal grooming.
The first electric hairdryers in 1900 were so heavy and dangerous that they were only used in salons, and it took decades before smaller, safer home versions made blow-drying a normal daily activity!
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