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

Dates provide nutrients like potassium, magnesium, and vitamin B6 that support heart, bone, and brain health. —Maggie O'Neill, Verywell Health, 24 Oct. 2025

The remaining elements include phosphorus, potassium, and nitrogen, which are key ingredients in fertilizers, according to researchers. —Prabhat Ranjan Mishra, Interesting Engineering, 23 Oct. 2025

Since orange trees are heavy feeders, look for a fertilizer that contains more nitrogen, such as a 2-1-1 or 3-1-1 nitrogen-phosphorus-potassium (NPK) ratio, as well as micro nutrients like magnesium, zinc, and iron. —Karen Brewer Grossman, Southern Living, 22 Oct. 2025

After a cleaning process to remove calcium, the team performed heat and potassium treatments to activate the remaining carbon. —Perri Thaler, IEEE Spectrum, 22 Oct. 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