Definitions for "Keelson"
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.
A beam attached to the top of the floors to add strength to the keel on a wooden boat.
Timber, or line of timbers, placed over the keel on the floor timbers, and running parallel to the keel, to provide additional strength to the bottom of the hull.
Keywords:  inner, fitting, above, place
An inner keel, fitting above or in place of the keel.
Keywords:  center, see
See center keelson