retractable

n a short respite n air passage provided by a retractable device containing intake and exhaust pipes

air passage provided by a retractable device containing intake and exhaust pipes

a retractable fin keel used on sailboats to prevent drifting to leeward

n a retractable fin keel used on sailboats to prevent drifting to leeward

plural of centreboard n a retractable fin keel used on sailboats to prevent drifting to leeward