Definition of "nitrosulphuric" []

• Consisting of a mixture of sulphuric acid and some nitrogen oxid: as, nitrosulphuric acid, formed by mixing one part of niter with eight or ten parts of sulphuric acid: a useful agent for separating the silver from the copper of old plated goods.

The Century Dictionary (Public Domain)

• "The product formed in this reaction is called nitrosulphuric acid or "chamber crystals.""
• "The relation between sulphuric acid and nitrosulphuric acid can be seen by comparing their structural formulas:"