from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A soft, silvery, highly reactive metallic element that is used as a heat transfer medium, in thermonuclear weapons, and in various alloys, ceramics, and optical forms of glass. Atomic number 3; atomic weight 6.941; melting point 179°C; boiling point 1,317°C; specific gravity 0.534; valence 1. See Table at element.
  • n. Any of several salts of lithium, especially lithium carbonate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3.
  • n. Lithium carbonate or other preparations of lithium metal used to treat manic depression and bipolar disorders.
  • n. A lithium battery.

from the GNU version of the Collaborative International Dictionary of English

  • n. A metallic element of the alkaline group, occurring in several minerals, as petalite, spodumene, lepidolite, triphylite, etc., and otherwise widely disseminated, though in small quantities.

from The Century Dictionary and Cyclopedia

  • n. Chemical symbol, Li or L; atomic weight, A metallic element having a silver-white luster, quickly tarnishing in the air.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals


From lithia.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin lithium, from lithia (in reference to Ancient Greek λίθος (lithos, "stone")) + -ium. (Wiktionary)



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