- any of certain acids containing vanadium, especially one having the formula H3VO4.
- any one of various oxyacids of vanadium, such as H 3 VO 4 (orthovanadic acid), HVO 4 (metavanadic acid), and H 4 V 2 O 7 (pyrovanadic acid), known chiefly in the form of their vanadate salts
