Source : Webster's Revised Unabridged Dictionary (1913)

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.]

         While greasy Joan doth keel the pot.     --Shak.

Keel \Keel\, n.
   A brewer's cooling vat; a keelfat.

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}.

   2. Fig.: The whole ship.

   3. A barge or lighter, used on the Type for carrying coal
      from Newcastle; also, a barge load of coal, twenty-one
      tons, four cwt. [Eng.]

   4. (Bot.) The two lowest petals of the corolla of a
      papilionaceous flower, united and inclosing the stamens
      and pistil; a carina. See {Carina}.

   5. (Nat. Hist.) 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 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.

Keel \Keel\, v. i. [imp. & p. p. {Keeled}; p. pr. & vb. n.
   {Keeling}.]
   1. To traverse with a keel; to navigate.

   2. To turn up the keel; to show the bottom.

   {To keel over}, to upset; to capsize. [Colloq.]

Keel \Keel\, n. (A["e]ronautics)
   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.

Source : WordNet®

keel
     v : walk as if unable to control one's movements; "The drunken
         man staggered into the room" [syn: {stagger}, {reel}, {lurch},
          {swag}, {careen}]

keel
     n 1: the median ridge on the breastbone of birds that fly
     2: one of the main longitudinal beams (or plates) of the hull
        of a vessel; can extend vertically into the water to
        provide lateral stability