| pentoxide | <chemistry> An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5. Origin: Penta- + oxide. Source: Websters Dictionary (01 Mar 1998) |
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| phosphorus pentoxide | P2O5;the ultimate anhydride of orthophosphoric acid; a drying and dehydrating agent; corrosive. (05 Mar 2000) |
| vanadium | <chemistry, element> A rare element of the nitrogen-phosphorus group, found combined, in vanadates, in certain minerals, and reduced as an infusible, grayish-white metallic powder. It is intermediate between the metals and the non-metals, having both basic and acid properties. Atomic weight: 51.2 Abbreviation: V Origin: NL, fr. Icel. Vanadis, a surname of the Scandinavian goddess Freya. (30 Mar 1998) |
| vanadium compounds | Inorganic compounds that contain vanadium as an integral part of the molecule. (12 Dec 1998) |
| vanadium group | Those elements resembling vanadium in chemical and metallurgical properties; included with vanadium are niobium and tantalum. (05 Mar 2000) |