meaning of lanthanum
1. A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc. , and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138. 5. Symbol La.
2. a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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