LANTHANUMS

Noun

lanthanums

plural of lanthanum

Source: Wiktionary

LANTHANUM

Lan"tha*num, n. Etym: [NL., fr. Gr. (Chem.)

Definition: 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. [Formerly written also lanthanium.]

Source: Webster’s Unabridged Dictionary 1913 Edition

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