A curved timber or wooden beam, especially one of a pair that form the frame of a medieval house or building by arching from ground to roof.
From Old English 'cruc' or Old Norse 'krókr,' meaning a bent or curved object; crucks were essential structural elements in medieval timber-frame construction.
Medieval houses with cruck frames are still standing in England and Europe today—these curved wooden beams can last 500+ years because the curved shape naturally resists bending and splitting!
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