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1. Oxford Dictionary

   nitrous acid

   • n.
     an unstable, weak acid, existing only in solution and in the gas phase, made by the action of acids on nitrites.

   • noun: nitrous acid

2. • 更多解釋

   nitrous acid

   • IPA[ˌnītrəs ˈasəd]

   美式

   • n.
     an unstable, weak acid, existing only in solution and in the gas phase, made by the action of ...

   Oxford American Dictionary