A building with rotating blades or sails powered by wind to grind grain or pump water.
From 'wind' plus 'mill,' Old English 'myln' from Latin 'molina.' Medieval technology combined air power with grain grinding, creating one of history's most efficient renewable energy machines.
Windmills were basically medieval AI—they did repetitive mechanical work without human labor, which freed people up for other tasks and fundamentally changed medieval economies, yet we rarely talk about them that way.
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