- found: Wikipedia, Sept. 8, 2012 (Potassium is a chemical element with symbol K (from Neo-Latin kalium) and atomic number 19. Elemental potassium is a soft silvery-white alkali metal)
- found: Wiktionary, Sept. 8, 2012 (kalium: (obsolete) potassium)
- found: Merriam-Webster online dictionary, Sept. 8, 2012 (kalium: potassium)
- 1986-02-11: new
- 2012-12-06: revised
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