Where does “firmato” come from?

firmato (Latin) comes from Latin firmo, from Latin firmus, from Proto-Italic fermos, from Proto-Indo-European dʰer-mo-s, from Proto-Indo-European dʰer- — to support; to hold.

firmato (Latin): second-person singular future active imperative...

Definitions

second-person singular future active imperative...

Ancestry of “firmato”, step by step

Step	Language	Word	Meaning
1	Latin	firmo	I make firm, strengthen, harden, fortify
2	Latin	firmus	stable, strong, firm; faithful, steadfast, true
3	Proto-Italic	fermos	—
4	Proto-Indo-European	dʰer-mo-s	holding
5	Proto-Indo-European	dʰer-	to support; to hold

Every word from Proto-Indo-European dʰer- →Every word from Proto-Indo-European dʰer-mo-s →Every word from Proto-Italic fermos →