1. A longitudinal beam connected to the keel of ship to strengthen it
   "The shipwright carefully installed the keelson to reinforce the vessel's structure"
    
2. A longitudinal structure in a ship's hull, above the keel
   "The keelson provides additional strength to the ship's framework";
   - kelson

Derived forms: keelsons

Type of: beam

Part of: hull

Encyclopedia: Keelson