Where does “μητρο-” come from?

μητρο- (Greek) comes from Ancient Greek μητρός — genitive singular of μήτηρ.

μητρο- (Greek): matri-

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	μητρός	genitive singular of μήτηρ

μητρο- — Etymology, Origin & Word History | Etymology Explorer