Category:Pentad

Pen"tad, n. Etym: [gr. (chem.)

Defn: 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.

Pentad Pen"tad, a. (chem.)

Defn: having the valence of a pentad.