KEELSON Meaning of KEELSON in English n. (also kelson) a line of timber fastening a ship's floor-timbers to its keel. Etymology: ME kelswayn, perh. f. LG kielswin f. kiel KEEL(1) + (prob.) swin SWINE used as the name of a timber Oxford English vocab. Оксфордский английский словарь. 2012