The Collaborative International Dictionary of English v.0.48:

Jujube \Ju"jube\ (j[=u]"j[-u]b), n. [F., fr. L. zizyphum, Gr.
   zi`zyfon, Per. z[imac]zf[=u]n, zizaf[=u]n, zayzaf[=u]n.]
   1. The sweet and edible drupes (fruits) of several
      Mediterranean and African species of small trees, of the
      genus Zizyphus, especially the Zizyphus jujuba,
      Zizyphus vulgaris, Zizyphus mucronata, and Zizyphus
      Lotus. The last named is thought to have furnished the
      lotus of the ancient Libyan Lotophagi, or lotus eaters.
      [1913 Webster]

   2. A chewy gelatinous lozenge made of or in imitation of, or
      flavored with, the jujube fruit.
      [Webster 1913 Suppl.]

   Jujube paste, the dried or inspissated jelly of the jujube;
      also, a confection made of gum arabic sweetened.
      [1913 Webster] Jiujutsu
      Jujitsu
      Jujutsu