2. (noun)Jerusalem thorn, horsebean, Parkinsonia aculeata 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 Synonyms: horsebean, fava bean, broadbean, catechu, jujubebush, jujube