Definition of Lanthenum
Lan"tha*num (-nŭm), n. [NL., fr.
Gr. lanqa`nein to lie hid, to be concealed.]
(Chem.) 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.]
- Webster's Unabridged Dictionary (1913)
- a metallic chemical element (symbol La) with an atomic number of 57.
- The Nuttall Encyclopedia
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