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Noun: centerboard  'sen-tur,bord
Usage: US (elsewhere: centreboard)
  1. A retractable fin keel used on sailboats to prevent drifting to leeward
    "They lowered the centerboard to improve the boat's stability";
    - centreboard [Brit, Cdn], drop keel, sliding keel [Brit]

Derived forms: centerboards

Type of: fin keel

Part of: sailboat [N. Amer], sailing boat [Brit]

Encyclopedia: Centerboard