Lanthanum Definition
lănthə-nəm
noun
A soft, malleable, silvery chemical element, one of the rare-earth elements and the first member of the lanthanide series: symbol, La; at. no. 57
Webster's New World
Synonyms:
- atomic number 57
- la
Origin of Lanthanum
New Latin from Greek lanthanein to escape notice (from the finding of the element hidden in oxide of cerium)
From American Heritage Dictionary of the English Language, 5th Edition
From Ancient Greek λανθάνω (lanthanō, “escape notice"), because it had gone long undetected in mineral ores.
From Wiktionary
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