-il | OEDoS

-il Adjective-forming suffix indicating a relation. From Latin -ilis. From Proto-Italic *-īlis 'id.' From Proto-Indo-European *-i̯h₂-li̯- 'id.' An i-stem with an adjectival extension. Indo-European Romance Asturian -il, Portuguese -il, Galician -il, Catalan -il, French -ile, Italian -ile, Aromanian -ilji, Romanian -il de Vaan, M. Etymological Dictionary of Latin and Other Italic Languages. BRILL. 2014. Real Academia Española. Diccionario de la lengua española. Online. 23rd ed. Madrid: Espasa Calpa. 2014. http://www.rae.es/. Sihler, A. New Comparative Grammar of Greek and Latin. Oxford University Press. 2008.