Where does “tricorne” come from?

tricorne (French) comes from Latin tricornis, from Latin tri-, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

Ancestry of “tricorne”, step by step

Step	Language	Word	Meaning
1	Latin	tricornis	three-horned
2	Latin	tri-	three, tri-
3	Latin	trēs	—
4	Proto-Italic	trēs	three
5	Proto-Indo-European	*tréyes	—

tricorne — Etymology, Origin & Word History | Etymology Explorer