Where does “dezassete” come from?

dezassete (Portuguese) comes from Old Portuguese dez, from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

dezassete (Portuguese): seventeen

Definitions

seventeen

Ancestry of “dezassete”, step by step

dezassete traces back through two separate lines of ancestry.

via Old Portuguese dez

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

via Old Portuguese e

Step	Language	Word	Meaning
1	Old Portuguese	e	and; Alternative form of é
2	Latin	et	and; plus; though, even if
3	Proto-Indo-European	éti	beyond; over
4	Proto-Indo-European	h₁é	and, then
5	Proto-Indo-European	ǵʰe	Postpositional intensifying particle: indeed, at any rate, in fact

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