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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 hep·tad /ˈhɛpˌtæd/
 七個,七個成套之物,七價原子

From: Webster's Revised Unabridged Dictionary (1913)

 Hep·tad n.  Chem. An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.
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From: WordNet (r) 2.0

 heptad
      n : the cardinal number that is the sum of six and one [syn: seven,
           7, VII, sevener, septet]