WordNet (r) 3.0 (2006):

holy clover
    n 1: Eurasian perennial herb having pale pink flowers and curved
         pods; naturalized in Britain and North America grasslands
         on calcareous soils; important forage crop and source of
         honey in Britain [syn: sainfoin, sanfoin, holy
         clover, esparcet, Onobrychis viciifolia, Onobrychis
         viciaefolia]