agenesis

Dictionary: a·gen·e·sis (ā-jĕn'ĭ-sĭs) pronunciation

Absence or incomplete development of an organ or body part.

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Dental Dictionary: agenesis

(ājen′əsis)
n

The defective development or congenital absence of parts.

Britannica Concise Encyclopedia: agenesis

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Failure of all or part of an organ to develop during embryonic growth. Many forms of agenesis are lethal, such as absence of the entire brain (anencephaly), but agenesis of one organ of a pair may cause little problem. Agenesis of a kidney, bladder, testicle, ovary, thyroid, and lung are known. Agenesis of the arms or legs is called meromelia (absence of one or both hands or feet), phocomelia (normal hands and feet but no arms or legs), and amelia (complete absence of a limb or limbs). Agenesis may be caused by absence of embryonic tissue or by chemical exposure in the uterus, and it is often associated with other congenital disorders.

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Veterinary Dictionary: agenesis

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Absence of an organ due to nonappearance of its primordium in the embryo.

Wikipedia: Agenesis

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In medicine, agenesis refers to the failure of an organ to develop during embryonic growth and development. Many forms of agenesis are referred to by individual names, depending on the organ affected:

Agenesis of the corpus callosum- failure of the Corpus callosum to develop
Renal agenesis- failure of one or both of the kidneys to develop
Phocomelia- failure of the arms or legs to develop
Penile agenesis- failure of penis to develop
Müllerian agenesis - failure of the uterus and part of the vagina to develop

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Copyrights:

		Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more
		Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved. Read more
		Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved. Read more
		Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more
		Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Agenesis". Read more