sliding keel


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Noun1.sliding keel - a retractable fin keel used on sailboats to prevent drifting to leeward
daggerboard - a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel
fin keel - a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability
sailboat, sailing boat - a small sailing vessel; usually with a single mast