The Collaborative International Dictionary of English v.0.48:

kebab \kebab\, kebob \kebob\, n.
   See kabab and kabob.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Cabob \Ca*bob"\, n. [Hindi kab[=a]b] [Now more commonly spelled
   kabob.]
   1. A small piece of mutton or other meat roasted on a skewer;
      -- so called in Turkey and Persia. [Also spelled kebab,
      kebob, or kabab.]
      [1913 Webster]

   2. A leg of mutton roasted, stuffed with white herrings and
      sweet herbs. --Wright.
      [1913 Webster]

   shish cabob See shish kebob.
      [PJC]

WordNet (r) 3.0 (2006):

kebab
    n 1: cubes of meat marinated and cooked on a skewer usually with
         vegetables [syn: kabob, kebab, shish kebab]