Definition of centreboard noun from the Oxford Advanced Learner's Dictionary

 

centreboard

 noun
(especially US English centerboard)noun
BrE BrE//ˈsentəbɔːd//
 
; NAmE NAmE//ˈsentərbɔːrd//
 
 
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a board that can be passed through a hole in the bottom of a sailing boat to keep it steady when sailing