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(), n.[Gr. , , a body of five, fr. 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. Pen"tad a.(Chem.) Having the valence of a pentad. スポンサード リンク
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