Where does “balança” come from?

balança (Old Portuguese) comes from Latin bilancia, from Latin bilanx, from Latin bi-, from Proto-Italic *dwi- — two, bi-, di.

Ancestry of “balança”, step by step

Step	Language	Word	Meaning
1	Latin	bilancia	nominative neuter plural of bilanx; accusative...
2	Latin	bilanx	having two scales; a balance with two scalepans
3	Latin	bi-	having two parts; occurring twice
4	Proto-Italic	*dwi-	two, bi-, di