Princeton's WordNet

1. Christ's-thorn, Jerusalem thorn, Paliurus spina-christi(noun)

   thorny Eurasian shrub with dry woody winged fruit

2. jujube, jujube bush, Christ's-thorn, Jerusalem thorn, Ziziphus jujuba(noun)

   spiny tree having dark red edible fruits

3. Jerusalem thorn, horsebean, Parkinsonia aculeata(noun)

   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

4. catechu, Jerusalem thorn, Acacia catechu(noun)

   East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu