A keel is also a flat-bottomed boat, particularly the ones used on the rivers Tyne and Wear.
The actor who played Clayton Farlow in the TV series Dallas (1978-1991) was Howard Keel (1919-2004).
There was also a heavy-metal band named Keel in the 1980s.
In birdanatomy, the keel is a perpendicular extension of the breastbone to which wing muscles anchor, making possible powered flight.
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Large keels are common in sailboats, where they act as foils, using the forward motion of the boat to generate lift to counter the lateral force from the sails.
Keels are different from centerboards in that keels are often fixed (though some are retractable) and are often made of heavy materials to provide ballast to stabilize the boat.
Carina is the Latin word for keel and is the origin of the term careen (to clean a keel and the hull in general).