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Anion Definition: An ionic species having a negative charge. Anion Examples: free chloride in an aqueous table salt (NaCl) solution, singlet oxygen. Table of Common Anions. Return to the Chemistry Glossary Index. By Anne Marie Helmenstine, Ph.D.
An ion that carries a negative charge, going therefore to the positively charged anode; in salts, acid radicals are anions. An ion carrying a negative charge owing to a surplus of electrons. Anions in the body include bicarbonate, chloride, phosphate, sulfate, certain organic acids, and certain protein compounds.