a longitudinal beam or set of timbers or metal plates fastened inside the hull of a ship along the keel to add structural strength
Origin of keelsonprobably via Dutch kolsem ; from Danish kjølsvin, altered (infl. by svin, swine) ; from kjølsvill ; from kjøl, keel + sville, sill
A timber or girder fastened above and parallel to the keel of a ship or boat for additional strength.
Origin of keelsonAlteration (influenced by keel1) of Middle English kelswin, probably from Old Norse *kj&odie;lsv&imacron;n : kj&odie;lr, keel + sv&imacron;n, swine, timber; see s&umacron;- in Indo-European roots.