World English Dictionary
centreboard (ˈsɛntəˌbɔːd)
 
n
Compare daggerboard a supplementary keel for a sailing vessel, which may be adjusted by raising and lowering

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WordNet
centreboard

noun
a retractable fin keel used on sailboats to prevent drifting to leeward [syn: centerboard
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for centreboard
On a sailing boat, a keel or centreboard helps to prevent the boat from moving sideways.
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