Bilge keelson, also known as bilge runner or waterway keelson, refers to a structural element of a ship that runs longitudinally along the bottom of the bilge or centerline. This keelson provides additional support to the ship's hull and helps to reinforce areas that may be prone to damage and wear. Other synonyms for this term include the bilge stringer, the bilge rail, and the bilge clamp. The bilge keelson is an essential part of the ship's framework, providing a sturdy base for the hull and helping to ensure safe navigation in even the most challenging conditions.