• WordNet 3.6
    • n agenesis imperfect development; nondevelopment of a part
    • ***
Webster's Revised Unabridged Dictionary
    • n Agenesis (Physiol) Any imperfect development of the body, or any anomaly of organization.
    • ***
Century Dictionary and Cyclopedia
    • n agenesis In physiology, any anomaly of organization consisting in the absence or imperfect development of parts. Also called agenesia.
    • ***


Webster's Revised Unabridged Dictionary
Gr. 'a priv. + birth


In news:

Agenesis of the left pulmonary artery , with patent ductus arteriosus and hypoplasia of the left lung.
It would seem that agenesis of the female reproductive tract would be relatively straightforward, but—as this case illustrates—variations in presentation and degree can delay diagnosis well into adulthood.