Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

lithium

play
noun lith·i·um \ˈlith-ē-əm\

Medical Definition of lithium

  1. 1:  a soft silver-white element of the alkali metal group that is the lightest metal known and that is used in chemical synthesis and in storage batteries—symbol Li; see element table

  2. 2:  a lithium salt and especially lithium carbonate used in psychiatric medicine





Seen and Heard

What made you want to look up lithium? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a smart aleck

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

angry prompt oily maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ