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

  Hexad \Hex"ad\, n. [L. hexas, hexadis, the number six, Gr. ?, ?,
     fr. "e`x six.] (chem.)
     An atom whose valence is six, and which can be theoretically
     combined with, substituted for, or replaced by, six monad
     atoms or radicals; as, sulphur is a hexad in sulphuric acid.
     Also used as an adjective.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  hexad
      n 1: the cardinal number that is the sum of five and one [syn:
           six, 6, VI, sixer, sise, Captain Hicks, half a
           dozen, sextet, sestet, sextuplet, hexad]

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