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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Cen·ter·board, Cen·tre·board, n. Naut. A retractable or sliding keel used on sailboats, formed of a broad board or slab of wood or metal which may be raised into a water-tight case amidships, when in shallow water, or may be lowered to increase the area of lateral resistance and prevent drifting to leeward when the vessel is beating to windward. It is used in vessels of all sizes along the coast of the United States
 Syn: -- centreboard, drop keel, sliding keel.
 

From: WordNet (r) 2.0

 centreboard
      n : a retractable fin keel used on sailboats to prevent drifting
          to leeward [syn: centerboard, drop keel, sliding
          keel]