Keel 03 : Centerline strength member running fore and aft along the entire bottom of a vessel; the vessel's backbone to which the ship's ribs or shell plating are attached
Association of Marine Underwriters of San Francisco (AMUSF), Glossary of Marine Insurance and Shipping Terms, http://www.amusf.com/Definitions_A.htm, CA, USA 2011. (Mrtm Insur and Shipping - Amer) {575}