Found 2 items, similar to centreboard.
English → English (WordNet) Definition: centreboard centreboard n : a retractable fin keel used on sailboats to prevent drifting to leeward [syn: centerboard, drop keel, sliding keel ]
English → English (gcide) Definition: centreboard centreboard \centreboard\ n. same as centerboard. Syn: centerboard, drop keel, sliding keel. [WordNet 1.5]