Source : Webster's Revised Unabridged Dictionary (1913)

Sainfoin \Sain"foin\ (?; 277), n. [F., fr. sain wholesome (L.
   sanus; see {Sane}.) + foin hay (L. f[ae]num); or perh. fr.
   saint sacred (L. sanctus; see {Saint}) + foin hay.] (Bot.)
   (a) A leguminous plant ({Onobrychis sativa}) cultivated for
       fodder. [Written also {saintfoin}.]
   (b) A kind of tick trefoil ({Desmodium Canadense}). [Canada]

Source : WordNet®

sainfoin
     n : 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: {sanfoin}, {holy clover}, {esparcet},
          {Onobrychis viciifolia}, {Onobrychis viciaefolia}]