tetrad

名词 n.
中文释义
英 /ˈtɛtɹæd/    美 /ˈtɛtɹæd/|/ˈtetɹæd/

英文释义

名词 n.
  1. A group of four things.
    — Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
  2. Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
  3. A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
  4. A unit of land area of two by two (that is, four) square kilometres.
    — They took figures for the abundance of invasive weeds mapped according to the normal grid unit of the 'hectad', or 10 × 10 km square, and then looked at how abundant these species were mapped at a much finer scale – in 'tetrads', or 2 × 2 km squares, inside these hectads.
  5. A tetravalent atom or radical.
  6. A group of four basis vectors for a four-dimensional manifold in differential geometry.
  7. A chord comprised of four notes; a tetrachord.

词形变化

tetrads plural

词汇关系

衍生词
bitetrad intratetrad tetradic Tetradite tetrad of Fallot

词源

From Ancient Greek τετράς (tetrás), analysable as tetra- + -ad.
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