Where does “fornicação” come from?

fornicação (Portuguese) comes from Latin fornicatio, from Latin fornix, from Latin furnus, from Proto-Italic fornos, from Proto-Indo-European gʷʰr̥-nós, from Indo-European *gʷʰer-.

fornicação (Portuguese): fornication sexual intercourse, especially on the part of an unmarried person

Definitions

fornication sexual intercourse, especially on the part of an unmarried person

Ancestry of “fornicação”, step by step

Step	Language	Word	Meaning
1	Latin	fornicatio	fornication; whoredom, prostitution
2	Latin	fornix	arch, vault; brothel
3	Latin	furnus	oven; bakery
4	Proto-Italic	fornos	—
5	Proto-Indo-European	gʷʰr̥-nós	—
6	Indo-European	*gʷʰer-	—

Every word from Indo-European *gʷʰer- →Every word from Proto-Indo-European gʷʰr̥-nós →Every word from Proto-Italic fornos →