Pentad meaning

pĕntăd
A group of five.
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The number five.
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A series or group of five.
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A five-year period.
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A pentavalent element or radical.
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A group or series of five things.
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(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.

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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