centreboard

English Thesaurus

1. a retractable fin keel used on sailboats to prevent drifting to leeward (noun.artifact)

hypernym	:	fin keel,
definition	:	a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability (noun.artifact)

hyponym	:	daggerboard,
definition	:	a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel (noun.artifact)

part meronym	:	sailboat, sailing boat,
definition	:	a small sailing vessel; usually with a single mast (noun.artifact)