Preserved and sealed in a metal can or tin, especially used in British English for canned food.
From 'tin,' the metal, plus the past participle suffix '-ed.' Tinning (coating with tin) became popular in the 1800s as a food preservation method. The term 'tinned food' is standard British English, while Americans prefer 'canned.'
Tinned food was revolutionary when it arrived—it let sailors and soldiers eat vegetables and meat months after they were processed, which literally changed warfare and exploration. The Crimean War was one of the first major conflicts where tinned food fed armies on a massive scale.
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