potassium
/pəˈtæsiəm/ noun B2- 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. · We all need potassium, and green vegetables are a good source.
- An atom of this element. · This reaction substitutes a potassium for a sodium.
Plural potassiums
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