Is a Non-Metallic Oxide Called Acid Anhydrous or Acid Anhydride?

[1/2"]

Hi!
I just wanted to be clear wether non-metallic oxide is also known as

acid anhydrous or Acid anhydride?
thank you!

 

[Bohrok]

Nonmetal oxide are known as acid anhydrides. I believe anhydrous is an adjective and would need to be followed by a noun (in English), while anhydride is already a noun.