The biological/medical term agenesis (plural: ageneses) refers to failure of an organ to grow or develop during the embryological period.
Examples include:
- appendiceal agenesis
- cerebellar agenesis
- corpus callosum agenesis
- dental agenesis (anodontia)
- diaphragmatic agenesis
- dorsal pancreatic agenesis
- ductus venosus agenesis
- ear agenesis
- eye agenesis (see anophthalmia)
- eyelid agenesis
- gallbladder agenesis
- gonadal agenesis
- limb agenesis (see amelia)
- lung agenesis
- penile agenesis
- pericardial agenesis
- renal agenesis
- tongue agenesis (see aglossia)
- thyroid agenesis
- urethral agenesis
- uterine agenesis
- vaginal agenesis