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[ep-i-jen-uh-sis] /ˌɛp ɪˈdʒɛn ə sɪs/

Biology. the theory that an embryo develops from the successive differentiation of an originally undifferentiated structure (opposed to ).
Genetics. the approximately stepwise process by which genetic information is modified and translated into the substance and behavior of an organism.
See also .
Geology. ore deposition subsequent to the original formation of the enclosing country rock.
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)
the formation or alteration of rocks after the surrounding rock has been formed
alteration of the mineral composition of a rock by external agents: a type of metamorphism

epigenesis ep·i·gen·e·sis (ěp’ə-jěn’ĭ-sĭs)
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.


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  • Epigenetic

    [ep-i-juh-net-ik] /ˌɛp ɪ dʒəˈnɛt ɪk/ adjective 1. Biology. of or relating to epigenesis, or the successive differentiation of undifferentiated cells in an embryo. 2. Genetics. noting or pertaining to epigenetics, specifically, the process by which the expression of genetic information is modified on a molecular level without a change to the DNA sequence: the epigenetic […]

  • Epigenetics

    [ep-i-juh-net-iks] /ˌɛp ɪ dʒəˈnɛt ɪks/ noun, (used with a singular verb) 1. Genetics. the study of the process by which genetic information is translated into the substance and behavior of an organism: specifically, the study of the way in which the expression of heritable traits is modified by environmental influences or other mechanisms without a […]

  • Epigenome

    [ep-i-jee-nohm] /ˌɛp ɪˈdʒi noʊm/ noun 1. Genetics. a network of chemical compounds surrounding DNA that modify the genome without altering the DNA sequences and have a role in determining which genes are active in a particular cell.

  • Epigenomics

    [ep-i-jee-noh-miks, -nom-iks] /ˌɛp ɪ dʒiˈnoʊ mɪks, -ˈnɒm ɪks/ noun, (used with a singular verb) 1. Genetics. the study of epigenomes and their role in gene expression.

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