keelson

/ˈkiːl.sən/
noun
  1. A long, strong piece of wood or metal inside a ship's hull that runs along the top of the keel to add strength.
    • A steel keelson gives a modern fishing vessel extra rigidity when hauling heavy nets.
    • During the restoration, they discovered that the old wooden keelson was cracked and needed replacement.
    • The shipwright carefully bolted the keelson to the keel to reinforce the bottom of the boat.
Synonyms
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