Where does “plácido” come from?

plácido (Spanish) comes from Latin Placidus, from Latin -idus, from Proto-Italic *-iðos.

plácido (Spanish): placid

Definitions

Step	Language	Word	Meaning
1	Latin	Placidus	—
2	Latin	-idus	tending to
3	Proto-Italic	*-iðos	—

plácido — Etymology, Origin & Word History | Etymology Explorer