Where does “trihiemus” come from?

trihiemus (Latin) comes from Latin tres, from English three, from Middle English thre, from Old English þrī, from Proto-West Germanic þrīʀ, from Proto-Germanic þrīz, from Proto-Indo-European *tréyes.

Ancestry of “trihiemus”, step by step

trihiemus traces back through two separate lines of ancestry.

via Latin tres

Step	Language	Word	Meaning
1	Latin	tres	three; 3
2	English	three	A numerical value after two and before four....
3	Middle English	thre	three
4	Old English	þrī	three
5	Proto-West Germanic	þrīʀ	three
6	Proto-Germanic	þrīz	three
7	Proto-Indo-European	*tréyes	—

via Latin hiems

Step	Language	Word	Meaning
1	Latin	hiems	winter
2	Proto-Italic	*hiem-	—

Words derived from “trihiemus”

trimus
trimulus

Every word from Proto-Indo-European *tréyes →Every word from Proto-Germanic þrīz →Every word from Proto-West Germanic þrīʀ →