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Definition of keel:

  1. A barge or lighter, used on the Type for carrying coal from Newcastle; also, a barge load of coal, twenty- one tons, four cwt.
  2. A brewer's cooling vat; a keelfat.
  3. A longitudinal timber, or series of timbers scarfed together, extending from stem to stern along the bottom of a vessel. It is the principal timber of the vessel, and, by means of the ribs attached on each side, supports the vessel's frame. In an iron vessel, a combination of plates supplies the place of the keel of a wooden ship. See Illust. of Keelson.
  4. A projecting ridge along the middle of a flat or curved surface.
  5. Fig.: The whole ship.
  6. 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.
  7. The two lowest petals of the corolla of a papilionaceous flower, united and inclosing the stamens and pistil; a carina. See Carina.
  8. To cool; to skim or stir.
  9. To traverse with a keel; to navigate.
  10. To turn up the keel; to show the bottom.

Synonyms:

spin around, stagger, sag, prowl, lurch, distribute, base, shift, wobble, hull, blade, swag, beam, spin, whirl, tilt, berth, skunk, boom, bay, reel, bowsprit, pitch, gyrate, flounder, aft, careen, flag, bow, vessel, boat, amidships, bottom, keelson, bottom timber, bilge, droop.

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