English
potassium
Coined by British chemist Humphry Davy in 1807, from potassa (a Latinized form of potash) + -ium.
The story
Coined by British chemist Humphry Davy in 1807, from potassa (a Latinized form of potash) + -ium.
Today it means
noun A soft, waxy, silvery reactive metal that is never found unbound in nature; an element with atomic number 19 and atomic weight of 39.0983.
Language periods are conventional ranges, not dates for this word.
Etymograph / potassium