A curved timber or bracket inside a ship that reinforces the connection between the bow and the hull, providing structural support.
Compound: 'breast' (forward part of ship) + 'hook' (curved piece). Medieval shipwrights invented this reinforcement because stress concentrated where the bow met the hull.
Medieval wooden ships were engineering puzzles—the breasthook was a crucial innovation because it prevented the bow from cracking under the enormous stress of plowing through waves, essentially acting like a modern-day welder's joint.
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