Medical term:
preformation
pre·for·ma·tion the·o·ry
archaic theory that the embryo was fully formed in miniature within a gamete at the time of conception.
See also: homunculus. Compare: epigenesis.
See also: homunculus. Compare: epigenesis.
Synonym(s): emboitement, incasement theory
Farlex Partner Medical Dictionary © Farlex 2012
preformation
(prē′fôr-mā′shən)n.
1. The act of shaping or forming in advance; prior formation.
2. A theory popular in the 1700s that all parts of an organism exist completely formed in the germ cell and develop only by increasing in size.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
preformation
(prē-fawr-mā′shŭn)In embryology, the development of structures from pre-existing templates, e.g., of bones from cartilage templates.
Medical Dictionary, © 2009 Farlex and Partners
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