Last Updated：2025/11/23

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Prior formation. / (biology, historical) The theory that organisms are fully developed in the form of an egg or seed, and just increase in size (as opposed to epigenesis).

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preformation

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Source Word

preformation

IPA(Pronunciation)

/pɹiːfɔːˈmeɪʃ(ə)n/

Noun

countable uncountable historical

Prior formation. / (biology, historical) The theory that organisms are fully developed in the form of an egg or seed, and just increase in size (as opposed to epigenesis).

Japanese Meaning

事前の形成、予め構造が整えられている状態 / （生物学）個体が卵または種子の形で完全に形成されており、発生過程では単にサイズが拡大するだけという説、先形成説