preformation

noun
pre·​for·​ma·​tion | \ ˌprē-fȯr-ˈmā-shən How to pronounce preformation (audio) \

Definition of preformation

1 : previous formation
2 : the now discredited theory that every germ cell contains the organism of its kind fully formed and that development involves merely an increase in size — compare epigenesis sense 1, homunculus sense 2

Other Words from preformation

preformationist \ ˌprē-​fȯr-​ˈmā-​sh(ə-​)nist How to pronounce preformationist (audio) \ noun or adjective

First Known Use of preformation

1732, in the meaning defined at sense 1

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The first known use of preformation was in 1732

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preformation

noun
pre·​for·​ma·​tion | \ ˌprē-fȯr-ˈmā-shən How to pronounce preformation (audio) \

Medical Definition of preformation

: a now discredited theory in biology that every germ cell contains the organism of its kind fully formed and complete in all its parts and that development involves merely an increase in size from microscopic proportions to those of the adult — compare epigenesis

Other Words from preformation

preformationist \ -​shə-​nəst How to pronounce preformationist (audio) \ noun or adjective

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