The Collaborative International Dictionary of English v.0.48:

Keel \Keel\ (k[=e]l), v. t. & i. [AS. c[=e]lan to cool, fr.
   c[=o]l cool. See Cool.]
   To cool; to skim or stir. [Obs.]
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         While greasy Joan doth keel the pot.     --Shak.
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The Collaborative International Dictionary of English v.0.48:

Keel \Keel\, n.
   A brewer's cooling vat; a keelfat.
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The Collaborative International Dictionary of English v.0.48:

Keel \Keel\, n. [Cf. AS. ce['o]l ship; akin to D. & G. kiel
   keel, OHG. chiol ship, Icel. kj[=o]ll, and perh. to Gr.
   gay^los a round-built Ph[oe]nician merchant vessel, gaylo`s
   bucket; cf. Skr. g[=o]la ball, round water vessel. But the
   meaning of the English word seems to come from Icel. kj["o]lr
   keel, akin to Sw. k["o]l, Dan. kj["o]l.]
   1. (Shipbuilding) 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.
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   2. Fig.: The whole ship.
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   3. A barge or lighter, used on the Tyne for carrying coal
      from Newcastle; also, a barge load of coal, twenty-one
      tons, four cwt. [Eng.]
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   4. (Bot.) The two lowest petals of the corolla of a
      papilionaceous flower, united and inclosing the stamens
      and pistil; a carina. See Carina.
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   5. (Nat. Hist.) A projecting ridge along the middle of a flat
      or curved surface.
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   6. (Aeronautics) In a dirigible, a construction similar in
      form and use to a ship's keel; in an a["e]roplane, a fin
      or fixed surface employed to increase stability and to
      hold the machine to its course.
      [Webster 1913 Suppl.]

   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 Western rivers. [U. S.]
      (b) A low, flat-bottomed freight boat. See Keel, n., 3.


   Keel piece, one of the timbers or sections of which a keel
      is composed.

   On even keel, in a level or horizontal position, so that
      the draught of water at the stern and the bow is the same.
      --Ham. Nav. Encyc.

   On an even keel a. & adv., steady; balanced; steadily.
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The Collaborative International Dictionary of English v.0.48:

Keel \Keel\, v. i. [imp. & p. p. Keeled; p. pr. & vb. n.
   Keeling.]
   1. To traverse with a keel; to navigate.
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   2. To turn up the keel; to show the bottom.
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   To keel over, to upset; to capsize. [Colloq.]
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WordNet (r) 3.0 (2006):

keel
    n 1: a projection or ridge that suggests a keel
    2: the median ridge on the breastbone of birds that fly
    3: one of the main longitudinal beams (or plates) of the hull of
       a vessel; can extend vertically into the water to provide
       lateral stability
    v 1: walk as if unable to control one's movements; "The drunken
         man staggered into the room" [syn: stagger, reel,
         keel, lurch, swag, careen]