Reconstruction:Proto-Celtic/-os

This Proto-Celtic entry contains reconstructed terms and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.

Proto-Celtic

Etymology

From Proto-Indo-European *(ó)-os, which formed tómos-type event nouns from verbal roots.

Noun

*(o)-os m

1. Forms verbal nouns corresponding to o-grade causative/iterative verbs.

   ‎*rād-ī- + ‎*-os → ‎*rādos (“speech”)

   ‎*uɸo- (“under-”) + ‎*log-ī- (“to lay”) + ‎*-os → ‎*uɸologos (“hiding”)

Usage notes

This suffix causes the root to assume the o-grade. It can form both unprefixed and prefixed verbal nouns, unlike *-om (which can only make prefixed verbal nouns).

Inflection

Masculine o-stem
	singular	dual	plural
nominative	*-os	*-ou	*-oi
vocative	*-e	*-ou	*-oi
accusative	*-om	*-ou	*-oms
genitive	*-ī	*-ous	*-om
dative	*-ūi	*-obom	*-obos
locative	*-ei	*?	*?
instrumental	*-ū	*-obim	*-ūis

Derived terms

Proto-Celtic terms suffixed with *-os