Pentad

Definition:

• (n.) Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.
• (a.) Having the valence of a pentad.

Compare pentad with other words:

entad vs. pentad

pentad vs. polyad

monad vs. pentad

hydrogen vs. pentad

pentad vs. valence

five vs. pentad