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horizon |
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horizon [hôrī′zən] Etymology: Gk, horizein, to encircle a specific stage of human embryonic development determined by the appearance and ultimate formation of certain anatomic 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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