fin keel

English Thesaurus

1. a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability (noun.artifact)

hypernym	:	plate,
definition	:	a sheet of metal or wood or glass or plastic (noun.artifact)

hyponym	:	centerboard, centreboard, drop keel, sliding keel,
definition	:	a retractable fin keel used on sailboats to prevent drifting to leeward (noun.artifact)

part meronym	:	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)