horizon

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Related to sensible horizon: rational horizon

horizon

 [hŏ-ri´zon]
a specific anatomic stage of embryonic development, of which 23 have been defined, beginning with the unicellular zygote (fertilized egg) and ending 7 to 9 weeks later with the beginning of the fetal stage.

horizon

any layer of soil that is distinguishable when soil is examined in vertical sections.