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Webster's 1913 Dictionary

CENTERBOARD; CENTREBOARD

CENTERBOARD; CENTREBOARD Cen "ter *board `, Cen "tre *board, , n. (Naut. )

Defn: A movable or sliding keel 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 leeway when the vessel is beating to windward. It is used in vessels of all sizes along the coast of the United States

New American Oxford Dictionary

centerboard

cen ter board |ˈsentərˌbôrd ˈsɛntərbɔrd | ▶noun a pivoted board that can be lowered through the keel of a sailboat to reduce sideways movement. Compare with daggerboard.

Oxford Dictionary

centerboard

center |board ▶noun US spelling of centreboard.