pentad
n. 五, 五价物, 五天, 五年 [医] 五价物
发音
词形变化
释义与例句
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1.
Synonym of quintet: A group of five things, particularly
Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades.
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2.
Synonym of quintet: A group of five things, particularly
A five-day period, especially a temperature average taken every five days.
气象 -
3.
Synonym of quintet: A group of five things, particularly
A five-day division of the Chinese calendar, forming part of a solar term (Chinese: 候).
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4.
Synonym of quintet: A group of five things, particularly
A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.
化学Nitrogen is a pentad in the ammonium compounds.
词汇关系
相关短语
词源
From Ancient Greek πεντάς (pentás), from πέντε (pénte, “five”) + -άς (-ás, “-ad”). By surface analysis, pent- + -ad.
来源：wiktionary