Main Entry: po·tas·si·um

Pronunciation: \pə-ˈta-sē-əm\

Function: noun

Usage: often attributive

Etymology: New Latin, from potassa potash, from English potash

Date: circa 1807

: a silver-white soft light low-melting monovalent metallic element of the alkali metal group that occurs abundantly in nature especially combined in minerals — see element table