lithium
noun
lith·i·um
ˈli-thē-əm
1
: a chemical element of the alkali metal group that is the lightest metal known and that is used especially in alloys and glass, in mechanical lubricants, and in storage batteries see Chemical Elements Table
2
: a salt of lithium (such as lithium carbonate) used in psychiatric medicine
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Merriam-Webster unabridged
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