Where does “crijevo” come from?

crijevo (Serbo-Croatian) comes from Proto-Slavic červo, from Proto-Balto-Slavic ker-m/w-.

Ancestry of “crijevo”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	červo	belly; intestine, gut, bowel
2	Proto-Balto-Slavic	ker-m/w-	—

crijevo — Etymology, Origin & Word History | Etymology Explorer