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From The Collaborative International Dictionary of English v.0.48:
Keelson \Keel"son\, n. [Akin to Sw. k["o]lsvin, Dan. kj["o]lsviin, G. kielschwein; apparently compounded of the words keel and swine; but cf. Norweg. kj["o]lsvill, where svill is akin to E. sill, n. ] (Shipbuilding) 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. [1913 Webster] Cross keelson, a similar structure lying athwart the main keelson, to support the engines and boilers. [1913 Webster]