A chemical element (symbol V) with atomic number 23; it is a transition metal, used in the production of special steels. / (countable) A single atom of this element.

plural of vanadium

(inorganic chemistry) An orange crystalline powder, V₂O₅, used as a catalyst in the production of sulphuric acid etc.

(physics) The only stable isotope of vanadium, ⁵¹₂₃V, having twenty-three protons and twenty-eight neutrons

(physics) The naturally-occurring radioactive isotope of vanadium, ⁵⁰₂₃V, having twenty-three protons and twenty-seven neutrons; its half-life is 1.5 x 10¹⁷ years

Any of a range of alloys of vanadium and steel having improved strength and high-temperature stability

(biochemistry) A haloperoxidase, used by some algae to synthesise halogen compounds, that has a requirement for the element vanadium

Any of a class of blood pigments found in sea squirts, ascidians, and tunicates

plural of vanadium pentoxide

(inorganic chemistry) Group 5 of the periodic table, comprising vanadium, niobium, tantalum and dubnium