| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024va•na•di•um (və nā′dē əm),USA pronunciation n. [Chem.]- Chemistrya rare element occurring in certain minerals and obtained as a light-gray powder with a silvery luster or as a ductile metal: used as an ingredient of steel to toughen it and increase its shock resistance. Symbol: V;
at. wt.: 50.942;
at. no.: 23;
sp. gr.: 5.96.
- Icelandic Vanad(ís) epithet of Freya (Vana, genitive of Vanir Vanir + dís goddess) + Neo-Latin -ium -ium
- Neo-Latin (1830)
Collins Concise English Dictionary © HarperCollins Publishers:: vanadium /vəˈneɪdɪəm/ n - a toxic silvery-white metallic element occurring chiefly in carnotite and vanadinite and used in steel alloys, high-speed tools, and as a catalyst. Symbol: V; atomic no: 23; atomic wt: 50.9415; valency: 2–5; relative density: 6.11; melting pt: 1910±10°C; boiling pt: 3409°C
Etymology: 19th Century: New Latin, from Old Norse Vanadis, epithet of the goddess Freya + -ium |