-os

o- + -s |

lat. -os

o + s | dt. ös, frz. -eux, lat. -ōsus, -ōsos, -entus, -ōsa, -ōsum, -ose, -ous; agrie. -eis

-ös, -eux, -osus

Eigenschaft, Eigenart habend, tuend, seiend; Eigenschaft, Eigenart verstärkend;

agrie. -os

Etymology 1

From Proto-Hellenic *-os, from Proto-Indo-European *-os.

Suffix

-ος • (-os) m (genitive -ου); second declension

1. Added to verbal roots to form an o-grade action noun.

Usage notes

The accent is recessive.

Derived terms

Ancient Greek terms suffixed with -ος (o-grade)

Etymology 2

From Proto-Indo-European *-os.

Suffix

-ος • (-os) n (genitive -εος or -ους); third declension

1. Added to verbal roots to form a noun of result or an abstract noun of action.
   1. Added to the zero-grade.

      ‎ἔπᾰθον (épathon, “I experienced”, aorist) + ‎-ος (-os) → ‎πᾰ́θος (páthos, “experience, emotion”)

   2. Added to the e-grade.

      ‎μείρομαι (meíromai, “to receive as one's portion”) + ‎-ος (-os) → ‎μέρος (méros, “part”)

Etymology 3

Suffix

-ος • (-os)

1. Nominative singular of masculine and feminine second-declension nouns

   ἄνθρωπος m or f (ánthrōpos, “person”)

2. Masculine nominative singular of first- and second-declension adjectives

   ἄλλος m (állos, “other”)

3. Masculine and feminine nominative singular of second-declension adjectives

   ἄδικος m or f (ádikos, “unjust”)

4. Genitive singular of consonant-stem or uncontracted third-declension nouns

   ὀνόματος n (onómatos, “of a name”)

5. Genitive singular of consonant-stem or uncontracted third-declension masculine or neuter adjectives

   παντός m or n (pantós, “of the whole of”)