Octad

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

  octad
       n : the cardinal number that is the sum of seven and one [syn: {eight},
            {8}, {VIII}, {eighter}, {eighter from Decatur}, {ogdoad},
            {octonary}, {octet}]