horse bean (Noun) — A bean plant cultivated for use animal fodder.
horse bean (Noun) — Seed of the broad-bean plant.
horse bean (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.