tetrads

四个一组的事物。

A group of four things.

在减数分裂过程中,两对姐妹染色单体(二分体对)以特定方式排列,通常位于赤道面上。

Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.

由减数分裂小孢子发生产生的四个单倍体未成熟花粉粒,呈四面体排列。

A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.

一种土地面积单位,二乘二(即四)平方公里。

A unit of land area of two by two (that is, four) square kilometres.

四价原子或基团。

A tetravalent atom or radical.

微分几何中四维流形的四个基向量组。

A group of four basis vectors for a four-dimensional manifold in differential geometry.

由四个音符组成的和弦；四音和弦。

A chord comprised of four notes; a tetrachord.