Source : Webster's Revised Unabridged Dictionary (1913)

Jujube \Ju"jube\ (j[=u]"j[-u]b), n. [F., fr. L. zizyphum, Gr.
   zi`zyfon, Per. z[=i]zf[=u]n, zizaf[=u]n, zayzaf[=u]n.]
   The sweet and edible drupes (fruits) of several Mediterranean
   and African species of small trees, of the genus {Zizyphus},
   especially the {Z. jujuba}, {Z. vulgaris}, {Z. mucronata},
   and {Z. Lotus}. The last named is thought to have furnished
   the lotus of the ancient Libyan Lotophagi, or lotus eaters.

   {Jujube paste}, the dried or inspissated jelly of the jujube;
      also, a confection made of gum arabic sweetened.

Christ's-thorn \Christ's-thorn`\, n. (Bot.)
   One of several prickly or thorny shrubs found in Palestine,
   especially the {Paliurus aculeatus}, {Zizyphus
   Spina-Christi}, and {Z. vulgaris}. The last bears the fruit
   called jujube, and may be considered to have been the most
   readily obtainable for the Crown of Thorns.