Where does “decu-viria” come from?

decu-viria (Latin) comes from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

Ancestry of “decu-viria”, step by step

Step	Language	Word	Meaning
1	Latin	decem	ten; 10
2	Latin	-nus	-an
3	Proto-Italic	-nos	Creates verbal adjectives from verb stems
4	Proto-Indo-European	-nós	Creates verbal adjectives from roots

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