Where does “undécimo” come from?

undécimo (Portuguese) comes from Latin undecimus, from Latin undecim, from Latin oinodecem, from Proto-Indo-European óynom déḱm̥t.

undécimo (Portuguese): eleventh

Definitions

Step	Language	Word	Meaning
1	Latin	undecimus	eleventh
2	Latin	undecim	eleven; 11
3	Latin	oinodecem	—
4	Proto-Indo-European	óynom déḱm̥t	—

undécimo — Etymology, Origin & Word History | Etymology Explorer