A person who preserves food by canning, or a machine used to seal food in cans.
From 'can' (the container) plus the agent suffix '-er,' meaning one who cans or performs the action of canning. The term emerged in the 19th century as commercial food preservation became common.
Before refrigerators, canners were the heroes who made sure families could eat fresh vegetables in winter—they turned summer harvests into shelf-stable food through science and boiling water!
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