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Meaning of ION

Pronunciation:  'Iun

WordNet Dictionary
[n]  a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons

ION is a 3 letter word that starts with I.


 See Also: anion, cation, particle



Webster's 1913 Dictionary
  1. \-ion\ (?; 106). [L. -io, acc. -ionem: cf. F. -ion.]
    A noun suffix denoting act, process, result of an act or a
    process, thing acted upon, state, or condition; as,
    revolution, the act or process of revolving; construction,
    the act or process of constructing; a thing constructed;
    dominion, territory ruled over; subjection, state of being
    subject; dejection; abstraction.
  2. \I"on\, n. [Gr. ?, neut, of ?, p. pr. of ? to go.] (Elec.
    One of the elements which appear at the respective poles when
    a body is subjected to electro-chemical decomposition. Cf.
    {Anion}, {Cation}.
  3. \I"on\, n.
    1. One of the electrified particles into which, according to
       the electrolytic dissociation theory, the molecules of
       electrolytes are divided by water and other solvents. An
       ion consists of one or more atoms and carries a unit
       charge of electricity, 3.4 x 10^{-10} electrostatic units,
       or a multiple of this. Those which are positively
       electrified (hydrogen and the metals) are called
       {cations}; negative ions (hydroxyl and acidic atoms or
       groups) are called {anions}.
    Note: Thus, hydrochloric acid ({HCl}) dissociates, in aqueous
          solution, into the hydrogen ion, H^{+}, and the
          chlorine ion, Cl^{-}; ferric nitrate, {Fe(NO3)3},
          yields the ferric ion, Fe^{+++}, and nitrate ions,
          NO3^{-}, NO3^{-}, NO3^{-}. When a solution containing
          ions is made part of an electric circuit, the cations
          move toward the cathode, the anions toward the anode.
          This movement is called migration, and the velocity of
          it differs for different kinds of ions. If the
          electromotive force is sufficient, electrolysis ensues:
          cations give up their charge at the cathode and
          separate in metallic form or decompose water, forming
          hydrogen and alkali; similarly, at the anode the
          element of the anion separates, or the metal of the
          anode is dissolved, or decomposition occurs.
    2. One of the small electrified particles into which the
       molecules of a gas are broken up under the action of the
       electric current, of ultraviolet and certain other rays,
       and of high temperatures. To the properties and behavior
       of ions the phenomena of the electric discharge through
       rarefied gases and many other important effects are
       ascribed. At low pressures the negative ions appear to be
       electrons; the positive ions, atoms minus an electron. At
       ordinary pressures each ion seems to include also a number
       of attached molecules. Ions may be formed in a gas in
       various ways.
Biology Dictionary
 Definition: An atom or molecule that has gained or lost electrons and thus has a net positive or negative charge.
 Definition: A charged particle.
Thesaurus Terms
 Related Terms: acid, acidity, agent, alkali, alkalinity, alloisomer, anion, antacid, atom, atomic model, base, biochemical, cation, chemical, chemical element, chromoisomer, compound, copolymer, dimer, electrocoating, electroetching, electrogalvanization, electrogilding, electrograving, electrolysis, electrolyte, electron, electroplating, element, galvanization, heavy chemicals, high polymer, homopolymer, hydracid, inorganic chemical, ionization, ionogen, isomer, macromolecule, meson, metamer, molecule, monad, monomer, neutralizer, nonacid, nonelectrolyte, nuclear atom, nuclear particle, nuclide, organic chemical, oxyacid, planetary shell, polymer, proton, pseudoisomer, quark, radical, reagent, shell, subshell, sulfacid, tagged atom, tracer, tracer atom, trimer, valence shell