постфикс

Noun

 * 1)  a suffix which follows an inflectional ending
 * 2)  suffix, postfix

Usage notes

 * The narrow sense (“a suffix which follows an inflectional ending”) is traditionally used in Russian grammar classes and textbooks.
 * The wide sense is often used in linguistics due to the narrow sense of (unlike suffix in English usage,  in Russian excludes inflectional endings).