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.

horizon

[hôrī′zən]
Etymology: Gk, horizein, to encircle
a specific stage of human embryonic development determined by the appearance and ultimate formation of certain anatomical characteristics. The classification comprises 23 stages, each lasting 2 to 3 days, beginning with the fertilization of the ovum and ending 7 to 9 weeks later with the initiation of the fetal period of intrauterine life.

horizon

any layer of soil that is distinguishable when soil is examined in vertical sections.
References in periodicals archive ?
The Moon did finally clear the local horizon, and a bright moonbow did eventually appear, but not until the early hours of the next morning
The by-now familiar data-entry menus appear at the top of the Java window, while the upper portion of the display features a Mercator view of the local horizon with the positions of the Sun and Moon depicted for various times throughout their periods of visibility.
It has no local horizon mode to show the sky as it would appear from your observing site.
At any given time half of these will be above the local horizon.
The computer, of course, has no knowledge of your local horizon with its trees and buildings.

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