Where does “calamentum” come from?

calamentum (Medieval Latin) comes from Latin calaminthe, from Ancient Greek καλαμίνθη — catmint.

Ancestry of “calamentum”, step by step

Step	Language	Word	Meaning
1	Latin	calaminthe	—
2	Ancient Greek	καλαμίνθη	catmint

calamentum — Etymology, Origin & Word History | Etymology Explorer