Where does “seropositivo” come from?

seropositivo (Portuguese) comes from Portuguese positivo, from Latin posītivus, from Latin pōnō, from Proto-Italic poznō, from Proto-Italic pozinō, from Proto-Italic sinō.

Ancestry of “seropositivo”, step by step

StepLanguageWordMeaning
1Portuguesepositivoaffirmative; positive; optimistic
2Latinposītivuspositive
3Latinpōnōto place; to put; to lay
4Proto-Italicpoznō—
5Proto-Italicpozinō—
6Proto-Italicsinō—
Every word from Proto-Italic sinō →Every word from Proto-Italic pozinō →Every word from Proto-Italic poznō →