Definitions for keelsonˈkɛl sən, ˈkil-
Random House Webster's College Dictionary
keel•sonˈkɛl sən, ˈkil-(n.)
any of various fore-and-aft structural members lying above or parallel to the keel in the bottom of a hull.
Category: Nautical, Navy
Origin of keelson:
1605–15; < LG kielswin lit., keel swine
a longitudinal beam connected to the keel of ship to strengthen it
A longitudinal beam fastened on top of the keel of a vessel for strength and stiffness.
Origin: First attested from 1611. Compare with Dutch kolzwijn, kolsem, Low German, kielswîn, German Kielschwein, Danish kølsvin, kölsvin, all with the same meaning. First part is keel while the second part is uncertain; possibly sill.
a piece of timber in a ship laid on the middle of the floor timbers over the keel, and binding the floor timbers to the keel; in iron vessels, a structure of plates, situated like the keelson of a timber ship