lanthanum

English dictionary entry

Meanings

noun

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

Pronunciation

lăn'thənəm /ˈlænθənəm/ LL-Q1860 (eng)-Vininn126-lanthanum.wav LL-Q1860 (eng)-Naomi Persephone Amethyst (NaomiAmethyst)-lanthanum.wav

Word forms

lanthanum lanthanums lantanium lanthanium

Etymology

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

Synonyms

Related words

lanthana lanthanate lanthanide lanthanite lanthanoid lanthanon Fosrenol rare earth

Derived words

dilanthanum lanthanian lanthanum carbonate lanthanum chloride lanthanum glass lanthanum nitrate lanthanum oxide lanthanum oxybromide lanthanum sesquioxide organolanthanum radiolanthanum

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