• WordNet 3.6
    • n horsebean 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
    • n horsebean seed of the broad-bean plant
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Century Dictionary and Cyclopedia
    • n horsebean 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.
    • n horsebean 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.
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In literature:

Their allowance consisted of one pint of water a day to each person, and they were fed twice a day with yams and horsebeans.
"The History of the Rise, Progress and Accomplishment of the" by Thomas Clarkson
The Irish beef they threw away, Cocklyn saying Snelgrave had horsebeans enough to last his crew six months.
"The Monarchs of the Main, Volume III (of 3)" by Walter Thornbury