Where does “Orthosalpetersäure” come from?

Orthosalpetersäure (German) comes from German Salpetersäure, from German Säure, from Middle High German siure.

Orthosalpetersäure (German): orthonitric acid

Definitions

Step	Language	Word	Meaning
1	German	Salpetersäure	nitric acid
2	German	Säure	acid
3	Middle High German	siure	—

Orthosalpetersäure — Etymology, Origin & Word History | Etymology Explorer