Where does “rigandus” come from?

rigandus (Latin) comes from Latin rigo, from Proto-Indo-European reyǵ- — to reach, stretch out.

Definitions

Step	Language	Word	Meaning
1	Latin	rigo	I lead, convey or conduct ; irrigate; I wet,...
2	Proto-Indo-European	reyǵ-	to reach, stretch out

rigandus — Etymology, Origin & Word History | Etymology Explorer