Definitions from Wiktionary ( )

▸ noun:  (nautical) A large beam along the underside of a ship’s hull from bow to stern.
▸ noun:  (nautical) A rigid, flat piece of material anchored to the lowest part of the hull of a ship to give it greater control and stability.
▸ noun:  (aeronautics) In a dirigible, a construction similar in form and use to a ship's keel; in an aeroplane, a fin or fixed surface employed to increase stability and to hold the machine to its course.
▸ noun:  (by extension) The rigid bottom part of something else, especially an iceberg.
▸ noun:  (nautical) A type of flat-bottomed boat.
▸ noun:  (zoology) The periphery of a whorl extended to form a more or less flattened plate; a prominent spiral ridge.
▸ noun:  (botany) The two lowest petals of the corolla of a papilionaceous flower, united and enclosing the stamens and pistil; a carina.
▸ verb:  (intransitive, followed by "over") to collapse, to fall
▸ verb:  To traverse with a keel; to navigate.
▸ verb:  To turn up the keel; to show the bottom.
▸ verb:  (transitive, obsolete) To cool; make cool; to cool by stirring or skimming in order to keep from boiling over.
▸ verb:  (transitive, obsolete) To moderate the ardour or intensity of; assuage; to appease, pacify, or lessen.
▸ verb:  (intransitive, obsolete) To become cool; cool down.
▸ noun:  (brewing) A broad, flat vessel used for cooling liquids; a brewer's cooling vat; a keelfat.
▸ noun:  (Scotland) Red chalk; ruddle.
▸ verb:  (Scotland, transitive) To mark with ruddle.
▸ verb:  (humorous, nonstandard) Pronunciation spelling of kill. [(transitive) To put to death; to extinguish the life of.]

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