Where does “treizième” come from?

treizième (French) comes from French treize, from Middle French treize, from Old French treize, from Latin tredecim, from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

treizième (French): thirteenth

Definitions

thirteenth

Ancestry of “treizième”, step by step

Step	Language	Word	Meaning
1	French	treize	thirteen
2	Middle French	treize	—
3	Old French	treize	—
4	Latin	tredecim	thirteen; 13
5	Latin	decem	ten; 10
6	Latin	-nus	-an
7	Proto-Italic	-nos	Creates verbal adjectives from verb stems
8	Proto-Indo-European	-nós	Creates verbal adjectives from roots

Words derived from “treizième”

13e
treizièmement

Every word from Proto-Indo-European -nós →Every word from Latin -nus →Every word from Latin decem →