lithium

[lith-ee-uhm]
noun
1.
Chemistry. a soft, silver-white metallic element, the lightest of all metals, occurring combined in certain minerals. Symbol: Li; atomic weight: 6.939; atomic number: 3; specific gravity: 0.53 at 20°C.
2.
Pharmacology. the substance in its carbonate or citrate form used in the treatment or prophylaxis of bipolar disorder or mania.

Origin:
1810–20; < Neo-Latin; see lith-, -ium

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World English Dictionary
lithium (ˈlɪθɪəm)
 
n
a soft silvery element of the alkali metal series: the lightest known metal, used as an alloy hardener, as a reducing agent, and in batteries. Symbol: Li; atomic no: 3; atomic wt: 6.941; valency: 1; relative density: 0.534; melting pt: 180.6°C; boiling pt: 1342°C
 
[C19: New Latin, from litho- + -ium]

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Etymonline
Word Origin & History

lithium
silver-white metallic element, 1818, coined in Mod.L. by Swed. chemist Jöns Jacob Berzelius (1779-1848) from Gk. lithos "stone," from its mineral origin and to distinguish it from two previously known alkalis of vegetable origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lithium lith·i·um (lĭth'ē-əm)
n.
Symbol Li
A soft, highly reactive metallic element. Atomic number 3; atomic weight 6.941; melting point 180°C; boiling point 1,342°C; specific gravity 0.534; valence 1.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lithium   (lĭth'ē-əm)  Pronunciation Key 
Symbol Li
A soft, silvery metallic element of the alkali group that occurs in small amounts in some minerals. It is the lightest of all metals and is highly reactive. Lithium is used to make alloys, batteries, glass for large telescopes, and ceramics. Atomic number 3; atomic weight 6.941; melting point 179°C; boiling point 1,317°C; specific gravity 0.534; valence 1. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Energizer has industry-leading lithium battery technology for powering up the
  high-tech devices that consumers use every day.
Helium and some lithium were initially formed from what was available after the
  big bang.
The choline nicotine lithium connection is somehow involved in the addiction.
As far as batteries are concerned, the raw-material question is where does the
  lithium come from.
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