Webster's English Dictionary

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cab

1. cab \'kab\ n [Heb qabh] : an ancient Hebrew unit of capacity equal to 
   about two quarts 
2. cab \'kab\ n [short for cabriolet] [short for cabin] 1a: CABRIOLET : a 
   similar light closed carriage (as a hansom)  1b: a carriage for hire  2: 
   TAXICAB  3a: the part of a locomotive that houses the engineer and 
   operating control s 3b: a comparable shelter on a truck, tractor, or crane