Definition of lanthanum in English:

lanthanum

Syllabification: lan·tha·num
Pronunciation: /ˈlanTHənəm
 
/

noun

The chemical element of atomic number 57, a silvery-white rare earth metal. (Symbol: La)
More example sentences
  • It belongs to the family known as the lanthanides, named after the first member of that series, lanthanum.
  • Green light is also emitted from some lanthanide elements: lanthanum, cerium, and terbium.
  • Oxalate efflux could not be triggered by treatment with the trivalent cation lanthanum or by phosphorus deficiency, indicating that the efflux was specific to the Al treatment.

Origin

mid 19th century: from Greek lanthanein 'escape notice' (because it was long undetected in cerium oxide) + -um.

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