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pentad n. 五個一組;五年間;五價元素 五個一組;五年間;五價元素 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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