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 advantages of using a business jet include the absence of underwing engines (which can obstruct radar scan) and a higher ceiling capability, giving a longer distance to the radar horizon and reduced loss of imagery in mountain shadows.
These include the radar horizon, the ionosphere used as an absorber, refractor, reflector and polarizer, tropospheric signal propagation, and radar far field expressions.
Although each ship provides a piece of the CEC picture, surface vessels are limited to a relatively short radar horizon.