Lithium Definition

lĭthē-əm

noun

A soft, silver-white, metallic chemical element, one of the alkali metals and the lightest metal: used in thermonuclear explosives, in metallurgy, etc.: symbol, Li; at. no. 3

Webster's New World

Any of various antidepressants containing lithium, esp. lithium carbonate.

Webster's New World

(uncountable) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3.

Wiktionary

Synonyms:

Synonyms:
atomic number 3
li

Other Word Forms of Lithium

Noun

Singular:

lithium

Plural:

lithiums

Origin of Lithium

From New Latin lithium, from lithia (in reference to Ancient Greek λίθος (lithos, “stone")) + -ium.

From Wiktionary
From lithia

From American Heritage Dictionary of the English Language, 5th Edition