Anion

from WordNet (r) 3.0 (2006)

anion
    n 1: a negatively charged ion

from The Collaborative International Dictionary of English v.0.48

Anion \An"i*on\, n. [Gr. ?, neut. ?, p. pr. of ? to go up; ? up
   + ? to go.] (Chem.)
   An electro-negative atom or group of atoms, or the element
   which, in electro-chemical decompositions, is evolved at the
   anode; -- opposed to {cation}. --Faraday.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

51 Moby Thesaurus words for "anion":
      acid, acidity, agent, alkali, alkalinity, alloisomer, antacid,
      atom, base, biochemical, cation, chemical, chemical element,
      chromoisomer, compound, copolymer, dimer, electrocoating,
      electroetching, electrogalvanization, electrogilding,
      electrograving, electrolysis, electrolyte, electroplating, element,
      galvanization, heavy chemicals, high polymer, homopolymer,
      hydracid, inorganic chemical, ion, ionization, ionogen, isomer,
      macromolecule, metamer, molecule, monomer, neutralizer, nonacid,
      nonelectrolyte, organic chemical, oxyacid, polymer, pseudoisomer,
      radical, reagent, sulfacid, trimer