- Biology. the theory that an embryo develops from the successive differentiation of an originally undifferentiated structure (opposed to preformation).
- Genetics. the approximately stepwise process by which genetic information is modified and translated into the substance and behavior of an organism.See also epigenetics.
- Geology. ore deposition subsequent to the original formation of the enclosing country rock.
Origin of epigenesis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for epigenesis
This point established, two hypotheses remain: that of 'pre-existence' and that of 'epigenesis'.Criticisms on "The Origin of Species"
Thomas H. Huxley
Digby's general theory thus represents a strange mixture of epigenesis and pangenesis, and is not entirely devoid of "virtues."Medical Investigation in Seventeenth Century England
Charles W. Bodemer
The differences between the exponents of evolution and epigenesis offer practical problems to be decided by experiment.
That then is our result: not evolutio, but epigenesis—epigenesis vitalistica.The Science and Philosophy of the Organism
Preformation: the doctrine of growth or development from already existing rudiments; opposed to epigenesis: q.v.Explanation of Terms Used in Entomology
John. B. Smith
- the widely accepted theory that an individual animal or plant develops by the gradual differentiation and elaboration of a fertilized egg cellCompare preformation (def. 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
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
- The theory that an individual is developed by successive differentiation of an unstructured egg rather than by a simple enlarging of a preformed entity.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.