from The Century Dictionary and Cyclopedia

  • Dextral, as a shell; turning or turned to the right, as the whorls of a spiral shell; dextrotropous: opposed to læotropic.
  • Turning to the right hand or in a clockwise direction: said of the direction of cleavage in the eggs of certain invertebrates.


Sorry, no etymologies found.


  • Such a division is described as dexiotropic if the clockwise daughter cell (in animal pole view) is the closer to the animal pole; in a laeotropic division the counterclockwise cell is closer to the animal pole.

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  • Where a transverse division places sister cells at the same level of the egg axis, they are usually numbered with reference to the chirality of the previous division: if the mother cell formed by a dexiotropic division, then the clockwise product of this cell's next division is given a superscript 2 and the counterclockwise product a superscript 1.

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  • Division of the 2m cells occurs with a slight asynchrony matching the timing of their birth; these divisions are all equal and dexiotropic, but nearly transverse

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  • Mitotic spindles in the quadrant founder cells are skewed clockwise, preparatory to dexiotropic division.

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  • Within each quadrant, the dexiotropic division of 1m

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  • (D) Fifth cleavage: the third-quartet micromeres are formed by dexiotropic division of macromeres; cells of both the first and second micromere quartets divide also dexiotropically, but with a slight delay.

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  • Also applying to shellfish are dexiotropic and laeotropic, where the shell's spire turns to the right and left, respectively.

    VERBATIM: The Language Quarterly Vol IX No 3

  • In the 2d clone, the six latest-born nuclei form a unique pattern consisting of three laeotropically skewed columns; as development proceeds, the lower-left nucleus in this array (2d The third quartet micromeres are formed by the dexiotropic division of the 2 M macromeres.

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