pentad

Noun

pen=tad

CIDE DICTIONARY

pentad, n. [Gr. penta`s penta`dos, a body of five, fr. pe`nte five.].

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. [1913 Webster]
Any grouping of five things. [PJC]

pentad, a.

Having the valence of a pentad. [1913 Webster]

pentad, n.
1 the number five.
2 a group of five.

Etymology

Gk pentas -ados f. pente five

For further exploring for "pentad" in Webster Dictionary Online

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