Source : Webster's Revised Unabridged Dictionary (1913)

Cab \Cab\ (k[a^]b), n. [Heb. qab, fr. q[=a]bab to hollow.]
   A Hebrew dry measure, containing a little over two (2.37)
   pints. --W. H. Ward. --2 Kings vi. 25.

Cab \Cab\ (k[a^]b), n. [Abbrev. fr. cabriolet.]
   1. A kind of close carriage with two or four wheels, usually
      a public vehicle. ``A cab came clattering up.''
      --Thackeray.

   Note: A cab may have two seats at right angles to the
         driver's seat, and a door behind; or one seat parallel
         to the driver's, with the entrance from the side or
         front.

   {Hansom cab}. See {Hansom}.

   2. The covered part of a locomotive, in which the engineer
      has his station. --Knight.

Source : WordNet®

cab
     n 1: a compartment in front of a motor vehicle where driver sits
     2: small two-wheeled horse-drawn carriage; with two seats and a
        folding hood [syn: {cabriolet}]
     3: a car driven by a person whose job is to take passengers
        where they want to go in exchange for money [syn: {hack},
        {taxi}, {taxicab}]