[keel.son] n [ME kelswayn, prob. of Scand origin; akin to Sw kolsvin keelson] (1598): a longitudinal structure running above and fastened to the keel of a ship in order to stiffen and strengthen its framework
KEELSON
Meaning of KEELSON in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012