A person or machine that makes, fills, or moves barrels.
From barrel (a cylindrical wooden container) plus the agent suffix -er, which creates nouns meaning 'one who does' an action. The word emerged in English during the industrial era when barrel-making became a specialized trade.
Barrelers were essential workers in colonial America and the 1800s—they didn't just make barrels, they were skilled craftspeople whose work was critical for storing everything from gunpowder to salted fish that fed entire nations. The profession almost completely disappeared with plastic containers.
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