lithium
noun
/ˈlɪθiəm/
/ˈlɪθiəm/
uncountable
(symbol Li)
a chemical element. Lithium is a soft, very light, silver-white metal used in batteries and alloys.
TOPICS Physics and chemistry
C2
Word Origin
early 19th cent.: from
lithia
‘
lithium oxide
’ +
-ium
.