centerboard
- n a retractable fin keel used on sailboats to prevent drifting to leeward
- With only a vestigial keel, she relies on a retractable centerboard to keep her steady in the water.
- Navigating with just the kind of seamanlike skill his grey-hulled, centerboard yawl Finisterre deserved, Skipper Carleton Mitchell logged a corrected time of 28 hr.
- Observers were impressed with the seamanship, even though such homestretch finesse was no longer necessarythe broad-beamed little centerboard yawl had won the Newport-to-Bermuda .