Definition of "pentadic" []

• Of, or relating to a pentad (adjective)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "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:"