from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of, or relating to a pentad

from The Century Dictionary and Cyclopedia

  • In chem., pentavalent.


Sorry, no etymologies found.


  • The second point is that an objection may be urged, as, for example, in ammonium chloride (the lecturer stated above that here N was a pentad, the addition of the chlorine having caused the N to assume the pentadic character), it may be said, why should you not suppose that it is the chlorine "which has altered its valency, and that the compound should be written:

    Scientific American Supplement, No. 324, March 18, 1882


Log in or sign up to get involved in the conversation. It's quick and easy.