Where does “морена” come from?

морена (Serbo-Croatian) comes from French moraine, from Italian morena, from Latin mūrus, from Old Latin moerus, from Proto-Indo-European mēy- — soft, tender, dear.

морена (Serbo-Croatian): a moraine

Definitions

a moraine

Ancestry of “морена”, step by step

Step	Language	Word	Meaning
1	French	moraine	moraine
2	Italian	morena	moraine, glacial till, drift
3	Latin	mūrus	wall, city wall(s), (usually of a city, as opposed to pariēs)
4	Old Latin	moerus	—
5	Proto-Indo-European	mēy-	soft, tender, dear

Every word from Proto-Indo-European mēy- →Every word from Old Latin moerus →Every word from Latin mūrus →