Source : Webster's Revised Unabridged Dictionary (1913)

Jerusalem \Je*ru"sa*lem\, n. [Gr. ?, fr. Heb. Y?r?sh[=a]laim.]
   The chief city of Palestine, intimately associated with the
   glory of the Jewish nation, and the life and death of Jesus
   Christ.

   {Jerusalem artichoke} [Perh. a corrupt. of It. girasole i.e.,
      sunflower, or turnsole. See {Gyre}, {Solar}.] (Bot.)
   (a) An American plant, a perennial species of sunflower
       ({Helianthus tuberosus}), whose tubers are sometimes used
       as food.
   (b) One of the tubers themselves.

   {Jerusalem cherry} (Bot.), the popular name of either of
      either of two species of {Solanum} ({S. Pseudo-capsicum}
      and {S. capsicastrum}), cultivated as ornamental house
      plants. They bear bright red berries of about the size of
      cherries.

   {Jerusalem oak} (Bot.), an aromatic goosefoot ({Chenopodium
      Botrys}), common about houses and along roadsides.

   {Jerusalem sage} (Bot.), a perennial herb of the Mint family
      ({Phlomis tuberosa}).

   {Jerusalem thorn} (Bot.), a spiny, leguminous tree
      ({Parkinsonia aculeata}), widely dispersed in warm
      countries, and used for hedges.

   {The New Jerusalem}, Heaven; the Celestial City.

Source : WordNet®

Jerusalem thorn
     n 1: thorny Eurasian shrub with dry woody winged fruit [syn: {Christ's-thorn},
           {Paliurus spina-christi}]
     2: spiny tree having dark red edible fruits [syn: {jujube}, {jujube
        bush}, {Christ's-thorn}, {Ziziphus jujuba}]
     3: large shrub or shrubby tree having sharp spines and pinnate
        leaves with small deciduous leaflets and sweet-scented
        racemose yellow-orange flowers; grown as ornamentals or
        hedging or emergency food for livestock; tropical America
        but naturalized in southern United States [syn: {horsebean},
         {Parkinsonia aculeata}]
     4: East Indian spiny tree having twice-pinnate leaves and
        yellow flowers followed by flat pods; source of black
        catechu [syn: {catechu}, {Acacia catechu}]