bilge keel

English Thesaurus

1. either of two lengthwise fins attached along the outside of a ship's bilge; reduces rolling (noun.artifact)

hypernym	:	keel,
definition	:	one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability (noun.artifact)

part meronym	:	vessel, watercraft,
definition	:	a craft designed for water transportation (noun.artifact)