Meaning of lithium

lith•i•um

Pronunciation: (lith'ē-um), [key]
— n.
  1. a soft, silver-white metallic element, the lightest of all metals, occurring combined in certain minerals. Symbol: Li; at. wt.: 6.939; at. no.: 3; sp. gr.: 0.53 at 20°C.
  2. the substance in its carbonate or citrate form used in the treatment or prophylaxis of bipolar disorder or mania.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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