A negatively charged ion, especially the ion that migrates to an anode in electrolysis.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "anion" in a sentence
"The chemical conditions that define acidity are that acid anion concentrations (sulfate, nitrate, organic acids) are present in excess of concentrations of base cations (typically calcium or magnesium), the products of mineral weathering reactions that neutralize acidity in soil or rock."
"The molecule is a chain of eight carbons and a single hydrogen called the octatetraynyl anion C8HÂ¯."
"But surely you understand that there is polarity in nature (cation/anion, stamen/pistil, male/female), a condition in which complimentary opposites exist in a synergistic fashion to produce and create."