centreboard n a retractable fin keel used on sailboats to prevent drifting to leeward Usage(s) Mahogany over a steel frame, with keel, stem, and sternpost of wood, a dagger-plate centreboard streamlined and built of teak, plated with bronze. First they rip off each other's ruby-red ventral fins which look like a sailboat's centreboard. Synonym(s) centerboard drop keel sliding keel
Quotes centreboard Ben Ainslie in Independent It's a bit of a concern,Ainslie said. "It's just about getting to the size when it catches on your centreboard or rudder or you have to sail round it."