Where does “раз-” come from?

раз- (Bulgarian) comes from Old Church Slavonic раз-, from Proto-Slavic orz- — dis-.

Ancestry of “раз-”, step by step

StepLanguageWordMeaning
1Old Church Slavonicраз-dis-, un
2Proto-Slavicorz-dis-

Words derived from “раз-”

Every word from Proto-Slavic orz- →Every word from Old Church Slavonic раз- →