Reconstruction:Proto-Slavic/-o-

• *-e- (after a soft consonant)

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

*-o-

1. used in compound words; -o-

   ‎*čьrnъ (“black”) + ‎*-o- + ‎*bylь (“plant, herb”) → ‎*čьrnobylь (“mugwort”)

   ‎*bělъ (“white”) + ‎*-o- + ‎*golvъ (“headed”) → ‎*bělogolvъ (“white headed”)

   ‎*dobrъ (“good”) + ‎*-o- + ‎*mirъ (“peace”) → ‎*Dobromirъ (given name)

• East Slavic:
  • Old East Slavic: -о- (-o-)
    • Middle Russian: -о- (-o-)
      • Russian: -о- (-o-)
    • Old Ruthenian: -о- (-o-)
      • Belarusian: (stressed) -о- (-o-), (unstressed) -а- (-a-)
      • Carpathian Rusyn: -о- (-o-)
      • Ukrainian: -о- (-o-)
  • Old Novgorodian: -о- (-o-)
• South Slavic:
  • Old Church Slavonic:

    Old Cyrillic script: -о- (-o-)

    Glagolitic script: -ⱁ- (-o-)

    • Church Slavonic: -о- (-o-)
    • Bulgarian: -о- (-o-)
    • Macedonian: -о- (-o-)
  • Serbo-Croatian:

    Cyrillic script: -о-

    Latin script: -o-

    • Slavomolisano: -o-
  • Slovene: -o-
• West Slavic:
  • Old Czech: -o-
    • Czech: -o-
  • Old Polish: -o-
    • Polish: -o-
    • Silesian: -o-
  • Polabian: -ü-
  • Pomeranian:
    • Kashubian: -o-
    • Slovincian: -ô-
  • Slovak: -o-
  • Sorbian:
    • Lower Sorbian: -o-
    • Upper Sorbian: -o-