From The Collaborative International Dictionary of English v.0.48 [gcide]:
Keelson \Keel"son\, noun [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, noun ] (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.
From WordNet (r) 3.0 (2006) [wn]:
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