centerboard

Noun
  1. A retractable fin keel used on sailboats to prevent drifting to leeward (synset 102997543)
    is a type of: fin keel - a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability
    subtypes: daggerboard - a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel
    is a part of: sailboat, sailing boat - a small sailing vessel; usually with a single mast
    same as: centreboard, drop keel, sliding keel

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