Pentad Definition

pĕntăd
noun
The number five.
Webster's New World
A series or group of five.
Webster's New World
A five-year period.
Webster's New World
A pentavalent element or radical.
Webster's New World

(chemistry) 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.

Nitrogen is a pentad in the ammonium compounds.
Wiktionary
Synonyms:
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Other Word Forms of Pentad

Noun

Singular:
pentad
Plural:
pentads

Origin of Pentad

  • Greek pentas pentad- group of five from pente five penkwe in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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