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3 definitions found

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

 octad
 八個一組,八價元素

From: Webster's Revised Unabridged Dictionary (1913)

 Oc·tad n.
 1. Chem. An atom or radical which has a valence of eight, or is octavalent.
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From: WordNet (r) 2.0

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