Chemical element
La
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Next: cerium (Ce)

• lantanium (obsolete)
• lanthanium (obsolete)

From Ancient Greek λανθάνω (lanthánō, “to escape notice”) +‎ -um (“a chemical element”), because it had gone long undetected in mineral ores.

• enPR: lăn'thənəm, IPA^(key): /ˈlænθənəm/

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lanthanum (countable and uncountable, plural lanthanums)

1. (uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
2. (countable) An atom of this element.

• La

• Fosrenol
• rare earth

Chemical element
La
Previous: barium (Ba)
Next: cerium (Ce)

• (Classical Latin) IPA^(key): [ˈɫan.tʰa.nũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈlan.ta.num]

lanthanum n (genitive lanthanī); second declension

1. lanthanum

Second-declension noun (neuter).

• IPA^(key): [lɑ˧nˈðaː˨nɔ˧m]

lanthanum n

1. (uncountable) lanthanum
2. A part of lanthanum

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