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4 definitions found

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

 pen·tad /ˈpɛnˌtæd/
 五個一組;五年間;五價元素

From: Webster's Revised Unabridged Dictionary (1913)

 Pen·tad n.  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.

From: Webster's Revised Unabridged Dictionary (1913)

 Pen·tad, a. Chem. Having the valence of a pentad.
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From: WordNet (r) 2.0

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