Source : Webster's Revised Unabridged Dictionary (1913)

Algaroba \Al`ga*ro"ba\, n. [Sp. algarroba, fr. Ar. al-kharr?bah.
   Cf. {Carob}.] (Bot.)
   (a) The Carob, a leguminous tree of the Mediterranean region;
       also, its edible beans or pods, called {St. John's
       bread}.
   (b) The Honey mesquite ({Prosopis juliflora}), a small tree
       found from California to Buenos Ayres; also, its sweet,
       pulpy pods. A valuable gum, resembling gum arabic, is
       collected from the tree in Texas and Mexico.

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}.