sain·foin 
(sānfoin′, săn-)
(sānfoin′, săn-)n.
A Eurasian plant (Onobrychis viciifolia) in the pea family, having pinnately compound leaves and pink or white flowers and often grown as a forage crop.
[French, from Old French, from Medieval Latin sānum faenum : Latin sānum, neuter of sānus, healthy + Latin faenum, hay; see dhē(i)- in the Appendix of Indo-European roots.]