Definition of "lithium" in English

noun

1. (uncountable) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3 and atomic weight of 6.94. It is a soft, silvery metal.

   • The importance of lithium-ion batteries makes lithium a potentially strategic natural resource.

2. (countable) A single atom of this element.

3. (pharmacology, uncountable) Lithium carbonate or other preparations of lithium metal used as a mood stabiliser to treat manic depression and bipolar disorders.

   • It seems like his moods are better since he started taking lithium.

4. (countable) A lithium battery.