A person who creates bonds or binding agreements; in construction, a brick or stone that extends across the full thickness of a wall to bind it together.
From 'bond' (to tie or connect) plus the agent suffix -er. In masonry, it developed from the medieval practice of laying stones in specific patterns to ensure structural integrity.
In medieval masonry, the strategic placement of bonders—stones running deep into walls—was the difference between a building that lasted centuries and one that crumbled within decades; it's why ancient walls still stand while sloppy construction fails.
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