Source : Webster's Revised Unabridged Dictionary (1913)

Carob \Car"ob\, n. [Cf. F. caroube fruit of the carob tree, Sp.
   garrobo, al-garrobo, carob tree, fr. Ar. kharr[=u]b, Per.
   Kharn[=u]b. Cf. {Clgaroba}.]
   1. (Bot.) An evergreen leguminous tree ({Ceratania Siliqua})
      found in the countries bordering the Mediterranean; the
      St. John's bread; -- called also {carob tree}.

   2. One of the long, sweet, succulent, pods of the carob tree,
      which are used as food for animals and sometimes eaten by
      man; -- called also {St. John's bread}, {carob bean}, and
      {algaroba bean}.

Source : WordNet®

carob
     n 1: long pod containing small beans and sweetish edible pulp;
          used as animal feed and source of a chocolate substitute
          [syn: {carob bean}, {algarroba bean}, {algarroba}, {locust
          bean}, {locust pod}]
     2: evergreen Mediterranean tree with edible pods; the biblical
        carob [syn: {carob tree}, {carob bean tree}, {algarroba},
        {Ceratonia siliqua}]
     3: powder from the ground seeds and pods of the carob tree;
        used as a chocolate substitute [syn: {carob powder}, {Saint-John's-bread}]