[awr-guh-noh-jen-uh-sis, awr-gan-oh‐]
Biology. the origin and development of an organ.
Also, organogeny [awr-guh-noj-uh-nee] .

1855–60; organo- + -genesis

organogenetic [awr-guh-noh-juh-net-ik, awr-gan-oh‐] , adjective
organogenetically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
organogenesis (ˌɔːɡənəʊˈdʒɛnɪsɪs)
1.  the formation and development of organs in an animal or plant
2.  Also called: organogeny the study of this process

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

organogenesis or·gan·o·gen·e·sis (ôr'gə-nō-jěn'ĭ-sĭs, ôr-gān'ə-)
The formation and development of the organs of living things. Also called organogeny.

or'gan·o·ge·net'ic (-jə-nět'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


in embryology, the series of organized integrated processes that transforms an amorphous mass of cells into a complete organ in the developing embryo. The cells of an organ-forming region undergo differential development and movement to form an organ primordium, or anlage. Organogenesis continues until the definitive characteristics of the organ are achieved. Concurrent with this process is histogenesis; the result of both processes is a structurally and functionally complete organ. The accomplishment of organogenesis ends the period during which the developing organism is called an embryo and begins the period in which the organism is called a fetus. See also histogenesis.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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