from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Chemistry Having a valence of 2.
  • adjective Having two sites of attachment. Used of an antibody or antigen.
  • adjective Containing antigens from two strains of a microorganism or virus. Used of a vaccine or serum.

from The Century Dictionary.

  • In chem., having power to combine with two monovalent atoms. Thus, the oxygen atom and the radical CH2 are divalent.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Chem.) Having two units of combining power; bivalent. Cf. valence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective chemistry Having a valence of two.

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

  • adjective having a valence of two or having two valences


Sorry, no etymologies found.


  • The hydrogen ion causes coagulation of surface tissue, which eventually appears as a grayish white area surrounded by erythema. 16 Fluoride ions freely penetrate the skin and continue into deeper tissues, causing cellular death and liquifaction necrosis of soft tissue. 22,15 Neutralization of fluoride ions occurs when fluoride complexes with calcium and other divalent cations in the tissues, forming an insoluble salt.

    Hydrofluoric Acid

  • The rationale for the use of topical preparations is to apply a divalent cation that will bind to form a insoluble salt, thus limiting percutaneous penetration of the fluoride ion. 15 Calcium gluconate gel 2.5 percent is a topical treatment for hydrofluoric acid burns.

    Hydrofluoric Acid

  • A trivalent carbon atom and a divalent hydrogen atom: who changed the rules without warning me?

    [eyewatch 1227] how stupid are people these days

  • False negatives (no light when there should be light): arsenate, perchlorate, most heavy metals, divalent cation chelating agents (EDTA is fine in small doses so long as Mg++ is in excess).

    Snowed under

  • Recent studies indicate that the major chemical form of anthropogenic mercury is gaseous elemental mercury, contributing about 53% of the total emissions, followed by gaseous divalent mercury with 37%.

    Global anthropogenic emissions of mercury to the atmosphere

  • In the octahedral layer (brucite), magnesium can be substituted by several divalent ions, Fe+2, Mn +2, or Ni+2.

    Geology of asbestos

  • In the presence of oxygen, the thermal decomposition of amphiboles is associated with an oxidation of divalent iron to trivalent iron, which may lead to an increase in the sample weight.

    Geology of asbestos

  • In place of the structure of the neutral atom we are left with the structure of the corresponding monovalent, divalent, or trivalent atomic ion.

    Johannes Stark - Nobel Lecture

  • Tetravalent terpenes, such as limonene, take four atoms of hydrogen whilst divalent terpenes (pinene, camphene) can fix only two, in accordance with the predictions made in the excellent work of Wallach.

    Paul Sabatier - Nobel Lecture

  • 'A surprising variety of enzymatic reactions in the body are activated by any of a number of divalent metallic ions of similar ionic radius.

    The Martian Way


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