The Collaborative International Dictionary of English v.0.48:
Sainfoin \Sain"foin\ (?; 277), n. [F., fr. sain wholesome (L. sanus; see Sane.) + foin hay (L. faenum); 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] [1913 Webster]