Definition of "agenesis" []

• Absence or incomplete development of an organ or body part. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Later, it was also determined he had a rare and potentially life-threatening condition called agenesis corpus callosum, which occurs when a portion of the brain fails to develop properly."
• "Christensen discovered a rare birth defect, known as agenesis of the corpus callosum, during a brain scan in the 1980s."
• "Peek suffered from a rare birth defect, agenesis of the corpus callosum, which basically meant that he was missing the bundle of fibers that connected both hemispheres of his brain."