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2 definitions found
 for tetrad
From The Collaborative International Dictionary of English v.0.48 :

  Tetrad \Tet"rad\, n. [L. tetras, -adis, Gr. ?, ?: cf. F.
     t['e]trade.]
     1. The number four; a collection of four things; a
        quaternion.
        [1913 Webster]
  
     2. (Chem.) A tetravalent or quadrivalent atom or radical; as,
        carbon is a tetrad.
        [1913 Webster] Tetradactyl

From WordNet (r) 3.0 (2006) :

  tetrad
      n 1: the cardinal number that is the sum of three and one [syn:
           four, 4, IV, tetrad, quatern, quaternion,
           quaternary, quaternity, quartet, quadruplet,
           foursome, Little Joe]

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