Where does “stimulo” come from?

stimulo (Latin) comes from Latin stimulus, from Proto-Indo-European stey- — to stick; compress; condense.

Ancestry of “stimulo”, step by step

Step	Language	Word	Meaning
1	Latin	stimulus	a goad, prick; a sting; stimulus, incentive
2	Proto-Indo-European	stey-	to stick; compress; condense

stimulo — Etymology, Origin & Word History | Etymology Explorer