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Ion
Pronunciation
Definition 1
An atom or a molecule that has a positive or negative electrical charge. Examples are sodium, potassium, calcium, chloride, and phosphate. These ions help move nutrients into cells, help move waste out of cells, and help nerves, muscles, the heart, and the brain work the way they should. (NCI Dictionary)
Definition 2
An atom or molecule having a positive or negative charge owing to the loss or gain of one or more electrons. (NCI Thesaurus)
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