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3 definitions found
 for pentad
From The Collaborative International Dictionary of English v.0.48 :

  Pentad \Pen"tad\, n. [Gr. penta`s penta`dos, a body of five, fr.
     pe`nte five.] (Chem.)
     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; as, nitrogen is
     a pentad in the ammonium compounds.
     [1913 Webster]
  
     2. Any grouping of five things.
        [PJC]

From The Collaborative International Dictionary of English v.0.48 :

  Pentad \Pen"tad\, a. (Chem.)
     Having the valence of a pentad.
     [1913 Webster] Pentadactyl

From WordNet (r) 3.0 (2006) :

  pentad
      n 1: the cardinal number that is the sum of four and one [syn:
           five, 5, V, cinque, quint, quintet, fivesome,
           quintuplet, pentad, fin, Phoebe, Little Phoebe]

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