Source : Webster's Revised Unabridged Dictionary (1913)

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.]

Keeled \Keeled\, a.
   1. (Bot.) Keel-shaped; having a longitudinal prominence on
      the back; as, a keeled leaf.

   2. (Zo["o]l.) Having a median ridge; carinate; as, a keeled
      scale.

Source : WordNet®

keeled
     adj 1: having a ridge or shaped like a ridge or the keel of a ship;
            "a carinate sepal" [syn: {ridged}, {carinate}, {carinated}]
     2: having or shaped like a carina or keel [syn: {carinate}, {carinated},
         {ridged}]