desinence
noun
des·i·nence
ˈdezənən(t)s,
-esə-
plural -s
: termination
the desinence of a verse
often : ending sense c (1)
any Russian inflectional form comprehends a stem and a desinence 
Roman Jakobson
Roman Jakobson 
Word History
Etymology
Middle French, from Medieval Latin desinentia, from Latin desinent-, desinens + -ia