Timber or wooden framework used in structural positions similar to a breastsummer, particularly in building construction.
Combination of 'breast' (front or forward position) and 'wood' (Old English wudu). This carpentry term appeared in medieval building records to describe load-bearing wooden beams.
In timber-frame buildings, 'breastwood' was often made from oak because builders learned through trial-and-error that oak could handle the compression stress of weight pressing down on it!
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