#keel one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability supertype: #beam long thick piece of wood or metal or concrete, etc., used in construction subtype: #bilge_keel either of two lengthwise fins attached along the outside of a ship's bilge; reduces rolling part of: #hull part: #fin_keel__finkeel a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability
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