afikso

Etymology
Compare 🇨🇬.

Noun

 * 1) affix a morpheme whose position within a word is not predictable from Esperanto word-compounding rules (compare )
 * Among the official morphemes, the true are bo-, eks-, ge-, mal-, pra-. These change the nature of the word, and therefore would occur at the end if they were part of a compound.
 * Among the official morphemes, the true are -aĉ-, -ĉjo, -njo. These do not change the nature of the word, and therefore would occur at the beginning if they were part of a compound.
 * -um- is sometimes included in this list, as it's irregular; however, it generally dominates the meaning of the word, and therefore would be expected to occur at the end