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epigenesis

[ep-i-jen-uh-sis] /ˌɛp ɪˈdʒɛn ə sɪs/
noun
1.
Biology. the theory that an embryo develops from the successive differentiation of an originally undifferentiated structure (opposed to preformation).
2.
Genetics. the approximately stepwise process by which genetic information is modified and translated into the substance and behavior of an organism.
See also epigenetics.
3.
Geology. ore deposition subsequent to the original formation of the enclosing country rock.
Origin
1800-1810
1800-10; epi- + -genesis
Related forms
epigenesist, epigenist
[ih-pij-uh-nist] /ɪˈpɪdʒ ə nɪst/ (Show IPA),
noun
epigenetic
[ep-i-juh-net-ik] /ˌɛp ɪ dʒəˈnɛt ɪk/ (Show IPA),
adjective
epigenetically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for epigenesist

epigenesis

/ˌɛpɪˈdʒɛnɪsɪs/
noun
1.
the widely accepted theory that an individual animal or plant develops by the gradual differentiation and elaboration of a fertilized egg cell Compare preformation (sense 2)
2.
the formation or alteration of rocks after the surrounding rock has been formed
3.
alteration of the mineral composition of a rock by external agents: a type of metamorphism
Derived Forms
epigenesist, epigenist (ɪˈpɪdʒɪnɪst) noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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epigenesist in Medicine

epigenesis ep·i·gen·e·sis (ěp'ə-jěn'ĭ-sĭs)
n.
The theory that an individual is developed by successive differentiation of an unstructured egg rather than by a simple enlarging of a preformed entity.


ep'i·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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