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Definition of Lanthanum
1. Noun. A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.
Definition of Lanthanum
1. n. 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.
Definition of Lanthanum
1. Noun. A metallic chemical element (''symbol'' La) with an atomic number of 57. ¹
¹ Source: wiktionary.com
Definition of Lanthanum
1. [n -S]
Medical Definition of Lanthanum
1.
Lexicographical Neighbors of Lanthanum
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