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pentad n. 五个一组;五年间;五价元素 五个一组;五年间;五价元素 pentad n 1: the cardinal number that is the sum of four and one [ synonym: { five}, { 5}, { V}, { cinque}, { quint}, { quintet}, { fivesome}, { quintuplet}, { pentad}, { fin}, { Phoebe}, { Little Phoebe}] Pentad \ Pen" tad\, n. [ Gr. penta` s penta` dos, a body of five, fr. pe` nte 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. [ 1913 Webster] 2. Any grouping of five things. [ PJC]
Pentad \ Pen" tad\, a. ( Chem.) Having the valence of a pentad. [ 1913 Webster] Pentadactyl
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