horizon

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

horizon

any layer of soil that is distinguishable when soil is examined in vertical sections.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
concludes with a discussion of Heidegger and existentialism and the problem, still outstanding in Husserl, of determining "the true horizon." L.
In that position, he tests their ability to line up vertical dots in a slanted matrix in a darkened room where they have no clue concerning the true horizon. With their bodies tilted, people's perceptual distortion more than doubles, compared to scores when they see the same matrix from a level chair.
With these laminar flow conditions, do look out if you can and don't be put off and wait until sunset proper when murk obscures the true horizon. It's a common misconception that the green flash can only be seen at the true horizon.