1. A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
   "Potassium, atomic number 19, is crucial for proper heart function";
   - potassium, K

Type of: metal, metallic element

Part of: brine, carnallite, kainite, langbeinite, saltwater, seawater, sylvine, sylvite