Where does “grutellum” come from?

grutellum (Medieval Latin) comes from Medieval Latin grutum, from Proto-Germanic grūtiz — ground material; grit.

Ancestry of “grutellum”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	grutum	flour; meal; flour, meal, used as seasoning for...
2	Proto-Germanic	grūtiz	ground material; grit

grutellum — Etymology, Origin & Word History | Etymology Explorer