centreboard

noun

1. （帆船的）稳向板龙骨
   a board that can be passed through a hole in the bottom of a sailing boat to keep it steady when sailing

1. Study on the mast socket and centreboard location hole of an 8 feet FRP Yacht
   8英尺FRP游艇帆杆座及稳水板孔结构浅议

noun

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

   Synonym:    centerboarddrop keelsliding keel