n :  any of various acids derived from tungsten trioxide : esp  :  the simplest acid H₂WO₄ analogous in composition to chromic acid and obtained as a yellow powder or as the white monohydrate H₂WO₄·H₂O but known chiefly in the form of its salts .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.