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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. 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.
  2. n. Any of several salts of lithium, especially lithium carbonate.

Century Dictionary and Cyclopedia

  1. n. Chemical symbol, Li or L; atomic weight, A metallic element having a silver-white luster, quickly tarnishing in the air. It may be cut with a knife, but is less soft than potassium or sodium; it fuses at 180° C., and takes fire at a somewhat higher temperature. Lithium is the lightest of all known solid bodies, its specific gravity being 0.5936. It forms salts analogous to those of potassium and sodium. It occurs only in combination, most abundantly in the minerals spodumene, petalite, amblygonite, triphylite (and lithiophilite), and lepidolite (lithia mica).

Wiktionary

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

GNU Webster's 1913

  1. n. (Chem.) 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.

WordNet 3.0

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

Etymologies

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

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‘lithium’ has been looked up 2370 times, loved by 1 person, added to 23 lists, commented on 1 time, and has a Scrabble score of 12.