didymium
noun
- a rare metal, formerly considered an element but later found to be a mixture of rare-earth elements neodymium and praseodymium: symbol, Di: the name is still used for naming oxides and salts
- any commercial mixture of rare-earth elements found in monazite sand
See didymium in American Heritage Dictionary 4
(dī-dĭmˈē-əm)
noun- Symbol Di A metallic mixture, once considered an element, composed of neodymium and praseodymium.
- A mixture of rare-earth elements and oxides used chiefly in manufacturing and coloring various forms of glass.
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