Where does “mъшъна” come from?

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

Ancestry of “mъшъна”, step by step

StepLanguageWordMeaning
1Church Slavonicmъшънъ—
2Proto-Slavicmъxъmoss
3Proto-Balto-Slavicmuša—
4Proto-Indo-Europeanmews-moss
Every word from Proto-Indo-European mews- →Every word from Proto-Balto-Slavic muša →Every word from Proto-Slavic mъxъ →