KEEL n.
A projecting ridge along the middle of a flat or curved surface. Bilge keel (Naut.), a keel peculiar to ironclad vessels, extending only a portion of the length of the vessel under the bilges. Ham. Nav. Encyc. -- False keel. See under False. -- Keel boat. (a) A covered freight boat, with a keel, but no sails, used on…