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 ?
Five hundred years ago Christopher Columbus gazed across these horizonless waters, plotting his voyage to the Canary Islands and then west, on to the fabled golden citadels of Asia - or so he believed.
Joining things" is the horizonless way (dao) of healing the wound of existence.
But it would also be apt to claim for the photographs--small, largely horizonless images of cloud formations--the relevance of orientation: The images posit a potentially rotating camera eye.
Legitimate concerns persist about the strategic efficacy and moral hazards offered up by the nation's horizonless War on Terror, including how much it is really going to cost and how it should, in justice, be paid for and in justice executed.
live in an acoustic, horizonless, boundless, olfactory space, rather than in visual space.
To swim to Wallace Stevens's Key West, which is shoreless, horizonless.
Point of view is consistently peculiar in all three works: In each case, we see a single horizonless frame extracted from what feels like a panning sweep.
Beyond its commercial associations, the abstract, horizonless space of the empty background also represents a clearing in and of the mind, a nowhere space in which to zone out and stare.