tetrad
[ˈtɛtˌræd]
n.
四元组;
四分染色体;
四价元素;
（数目）4;
例句:
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At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
此时每条染色体由一对染色单体构成,这两条联合的染色体称为四分体.
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Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.
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Microspore abortion occurred after the tetrad formation.
小孢子败育发生在四分体形成以后.
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A tetrad of distinct elementssearth, air, fire and water.
来自A. Stevens