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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

WordNet (r) 3.0 (2006) (WordNet)

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}]

The Collaborative International Dictionary of English v.0.48 (gcide)

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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pentad	查看　pentad　在Google字典中的解釋	Google英翻中〔查看〕
pentad	查看　pentad　在Yahoo字典中的解釋	Yahoo英翻中〔查看〕

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