The Collaborative International Dictionary
Flectional
Flectional \Flec"tion*al\, a. Capable of, or pertaining to, flection or inflection.
A flectional word is a phrase in the bud.
--Earle.
Wiktionary
flectional
a. Pertaining to flection; serving to bend or vary, specifically, pertaining to the terminal variation of words; inflectional.