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English word
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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun Lanthanum has 1 sense
- lanthanum(n = noun.substance) atomic number 57, la - a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth; is a kind of metal, metallic element
CIDE DICTIONARY
Lanthanum, n. [NL., fr. Gr. lanqa`nein to lie hid, to be concealed.].
A rare element of the rare earth group of the metals, of atomic number 57, allied to aluminum. 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 earth elements with which it is usually associated. Atomic weight 138.9. Symbol La. [1913 Webster]
OXFORD DICTIONARY
Lanthanum, n. Chem. a silvery metallic element of the lanthanide series which occurs naturally and is used in the manufacture of alloys.
Usage
Symb.: La.
Etymology
Gk lanthano escape notice, from having remained undetected in cerium oxide