from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A negatively charged ion, especially the ion that migrates to an anode in electrolysis.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An negatively charged ion.

from the GNU version of the Collaborative International Dictionary of English

  • n. An electro-negative atom or group of atoms, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed to cation.

from The Century Dictionary and Cyclopedia

  • n. In electricity, a term applied by Faraday to that element of an electrolyte which in electrochemical decompositions appears at the positive pole, or anode, as oxygen or chlorine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a negatively charged ion


from The American Heritage® Dictionary of the English Language, 4th Edition

From Greek, neuter present participle of anienai, to go up : ana-, ana- + ienai, to go; see ei- in Indo-European roots.


  • 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.

    Acid rain

  • The molecule is a chain of eight carbons and a single hydrogen called the octatetraynyl anion C8H¯.

    The Panda's Thumb: Prebiotic Chemistry Archives

  • 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.

    Spark plugs and transmissions

  • Groundwater interactions with surface-water systems greatly influence water quality characteristics such as cation, anion, nutrient, and dissolved organic matter concentrations, and even the fate and behavior of toxic pollutants.

    Freshwater ecosystems in the Arctic

  • The ocean carbon cycle comprises a physical pump, a biological pump, and an alkalinity or anion pump.

    Carbon cycle and climate change in the Arctic

  • An atom that becomes negatively charged due to an excess of electrons is called an anion, a negatively charged ion.


  • Defective anion transport activity of the abnormal band 3 in hereditary ovalocytic red blood cells.

    Parasite Rex

  • Production of NADPH dropped by 30 percent and superoxide anion dropped by a whopping 74 percent.

    Odds and ends | The Blog of Michael R. Eades, M.D.

  • My question is this: since BAS drugs operate via a non-absorbed, non-systemic action they are anion-exchange resins, are they at all dangerous?

    More statin madness | The Blog of Michael R. Eades, M.D.

  • It differs from other Trail Ridge lakes, with higher pH, alkalinity, and a different cation/anion mix that reflects groundwater inputs.

    Ecoregions of Florida (EPA)


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  • JM is not cooking up some anion soup!

    December 10, 2010