horsebean

from The Century Dictionary.

• noun In the southwestern United States, either of two species of palo verde, Parkinsonia aculeata and P. microphylla, the twigs of which are eaten by horses.
• noun A sort of bean so called from being fed to horses, or from its large size. The Jamaica horse-bean is Canavalia gladiata, having large legumes.

from the GNU version of the Collaborative International Dictionary of English.

• noun The seed of the broad-bean plant.
• noun A large shrub or shrubby tree (Parkinsonia aculeata) 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; originating in tropical America but naturalized in the Southern U. S.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun seed of the broad-bean plant
• 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
• noun a bean plant cultivated for use animal fodder