DICT.TW Dictionary Taiwan

 Keel·son 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.
 Cross keelson, a similar structure lying athwart the main keelson, to support the engines and boilers.
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