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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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00:10
Centreboard is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
Example sentences from the web
On a sailing boat, a keel or centreboard helps to prevent the boat from moving sideways.
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