Usually means: Embryonic development theory, miniature organism.
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We found 22 dictionaries that define the word preformation:

General (18 matching dictionaries)
  1. preformation: Merriam-Webster
  2. preformation: Oxford Learner's Dictionaries
  3. preformation: American Heritage Dictionary of the English Language
  4. preformation: Collins English Dictionary
  5. preformation: Vocabulary.com
  6. preformation: Wordnik
  7. preformation: Wiktionary
  8. preformation: Webster's New World College Dictionary, 4th Ed.
  9. preformation: Infoplease Dictionary
  10. preformation: Dictionary.com
  11. Preformation: Wikipedia, the Free Encyclopedia
  12. Preformation: Online Plain Text English Dictionary
  13. preformation: Webster's Revised Unabridged, 1913 Edition
  14. preformation: Rhymezone
  15. Preformation: AllWords.com Multi-Lingual Dictionary
  16. preformation: FreeDictionary.org
  17. preformation: Mnemonic Dictionary
  18. preformation: TheFreeDictionary.com

Medicine (4 matching dictionaries)
  1. preformation: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Hypermedia Glossary Of Genetic Terms (No longer online)
  4. preformation: Medical dictionary

(Note: See preformationist as well.)

Definitions from Wiktionary (preformation)

noun:  Prior formation.
noun:  (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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