Where does “mъшънъ” come from?

mъшънъ (Church Slavonic) comes from Proto-Slavic mъxъ, from Proto-Balto-Slavic muša, from Proto-Indo-European mews- — moss.

Ancestry of “mъшънъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicmъxъmoss
2Proto-Balto-Slavicmuša—
3Proto-Indo-Europeanmews-moss

Words derived from “mъшънъ”

Every word from Proto-Indo-European mews- →Every word from Proto-Balto-Slavic muša →Every word from Proto-Slavic mъxъ →