potassium

noun

po·​tas·​si·​um pə-ˈta-sē-əm 

often attributive

: 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 Chemical Elements Table

Examples of potassium in a Sentence

Recent Examples on the Web

Coffee grounds do contain nitrogen and micronutrients necessary for plants to thrive, but they shouldn’t be considered a major source since the amounts of other necessary nutrients like potassium, phosphorus, calcium, iron, and manganese are too small to be of any real value. —Karen Brewer Grossman, Southern Living, 12 Dec. 2025

These potassium-rich fruits can help support healthy blood pressure and may even help lower it over time. —Sohaib Imtiaz, Verywell Health, 12 Dec. 2025

Magnesium and potassium are important for muscle contraction, heart rhythms, and fluid balance. —Ruth Jessen Hickman, Health, 11 Dec. 2025

For sweetening, the Oreos contain maltitol, a type of sugar alcohol that’s also found in some fruits and vegetables; polydextrose, a soluble fiber; sucralose, a sweetener derived from sugar; and acesulfame potassium, a synthetic sweetener. —Dee-Ann Durbin, Fortune, 11 Dec. 2025

Word History

Etymology

New Latin, from potassa potash, from English potash

First Known Use

circa 1807, in the meaning defined above

Phrases Containing potassium

• potassium-argon
• potassium bromide
• potassium carbonate
• potassium chlorate
• potassium chloride
• potassium cyanide
• potassium dichromate
• potassium hydroxide
• potassium iodide
• potassium nitrate
• potassium permanganate
• potassium sorbate
• potassium sulfate

Kids Definition

potassium

noun

po·​tas·​si·​um pə-ˈtas-ē-əm 

: a silver-white soft light metallic element that has a low melting point and occurs abundantly in nature especially combined in minerals see element

Medical Definition

potassium

noun

po·​tas·​si·​um pə-ˈtas-ē-əm 

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

—symbol K see Chemical Elements Table