octad


From The Collaborative International Dictionary of English v.0.48:

Octad \Oc"tad\, n. [Gr. ?, ?, the number eight.]
   1. (Chem.) An atom or radical which has a valence of eight,
      or is octavalent.
      [1913 Webster]

   2. A group of eight things.
      [PJC]
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