Lanthanum

Language: English

Pronunciation: lanthan-um

Part of Speech: noun

Defined Definitions

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

User Defined Definitions

"a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth"

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