preformation

[ pree-fawr-mey-shuhn ]

/ ˌpri fɔrˈmeɪ ʃən /

noun

previous formation.

Biology. (formerly) the theory that the individual, with all its parts, preexists in the germ cell and grows from microscopic to normal proportions during embryogenesis (opposed to epigenesis).

Origin of preformation

First recorded in 1725–35; pre- + formation

OTHER WORDS FROM preformation

pre·for·ma·tion·ar·y, adjective

Words nearby preformation

prefigure, prefinished, prefix, preflight, preform, preformation, prefrontal, prefrontal area, prefrontal lobotomy, pregame, preganglionic

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for preformation

Preformation, identical with the original meaning of evolution, which see.
The Biological Problem of To-day|Oscar Hertwig
In this respect it is like its predecessor, the theory of preformation of the eighteenth century.
The Biological Problem of To-day|Oscar Hertwig
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
Let us first cast a historical glance at the older ontogeny, and the theory of preformation which is connected with it.
The Riddle of the Universe at the close of the nineteenth century|Ernst Haeckel

His shrewd comment on the preformation notion of development has been quoted (p. 20).
Pioneers of Evolution from Thales to Huxley|Edward Clodd

British Dictionary definitions for preformation

preformation

/ (ˌpriːfɔːˈmeɪʃən) /

noun

the act of forming in advance; previous formation

biology the theory, now discredited, that an individual develops by simple enlargement of a fully differentiated egg cellCompare epigenesis (def. 1)

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

单词	preformation
释义	preformation [ pree-fawr-mey-shuhn ] / ˌpri fɔrˈmeɪ ʃən / noun previous formation. Biology. (formerly) the theory that the individual, with all its parts, preexists in the germ cell and grows from microscopic to normal proportions during embryogenesis (opposed to epigenesis). Origin of preformation First recorded in 1725–35; pre- + formation OTHER WORDS FROM preformation pre·for·ma·tion·ar·y, adjective Words nearby preformation prefigure, prefinished, prefix, preflight, preform, preformation, prefrontal, prefrontal area, prefrontal lobotomy, pregame, preganglionic Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for preformation Preformation, identical with the original meaning of evolution, which see. The Biological Problem of To-day\|Oscar Hertwig In this respect it is like its predecessor, the theory of preformation of the eighteenth century. The Biological Problem of To-day\|Oscar Hertwig 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 Let us first cast a historical glance at the older ontogeny, and the theory of preformation which is connected with it. The Riddle of the Universe at the close of the nineteenth century\|Ernst Haeckel His shrewd comment on the preformation notion of development has been quoted (p. 20). Pioneers of Evolution from Thales to Huxley\|Edward Clodd British Dictionary definitions for preformation preformation / (ˌpriːfɔːˈmeɪʃən) / noun the act of forming in advance; previous formation biology the theory, now discredited, that an individual develops by simple enlargement of a fully differentiated egg cellCompare epigenesis (def. 1) 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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