afiksoido

Esperanto

Etymology tree

Proto-Indo-European *h₂éd

Proto-Italic *ad

Proto-Italic *ad-

Latin ad-

Proto-Indo-European *dʰeygʷ-der.

Proto-Italic *feigʷō

Latin fīvō

Latin fīgō

Latin affīgō

Latin affīxusder.

Esperanto afikso

Ancient Greek -ο- (-o-)der.

Latin -o-

Proto-Indo-European *weyd-der.

Ancient Greek εἶδος (eîdos)

Proto-Indo-European *-os

Proto-Indo-European *-ēs

Ancient Greek -ης (-ēs)

Ancient Greek -ειδής (-eidḗs)

Latin -oīdēslbor.

English -oidder.

Esperanto -oido

Esperanto afiksoido

From afikso (“affix”) +‎ -oido (similarity suffix).

afiksoido (accusative singular afiksoidon, plural afiksoidoj, accusative plural afiksoidojn)

(grammar) a morpheme which resembles or is treated as an affix, but behaves as a root, in that its position within a word is predictable from Esperanto word-compounding rules (compare afikso)
Among the official roots, the antaŭafiksoidoj are dis-, ek-, for-, mis-, re-, retro-; a few which derive from nouns (ĉef-, vir-), and prefixed prepositions

Among the official roots, the postafiksoidoj are -ado, -aĵo, -eco, -ulo, -eg-, -et-, -um-, -ano, -aro, -ejo, -ero, -estro, -ido, -ilo, -ino, -ingo, -ismo, -isto, -ono, -ujo, -ebla, -ema, -enda, -inda, -obla, -ope, -igi, -iĝi, and the participial suffixes