Here are some examples of how "-genesis" is used in medical terms:
* Pathogenesis: The development of a disease or abnormal condition.
* Histogenesis: The formation and development of tissues.
* Embryogenesis: The process of embryonic development.
* Carcinogenesis: The development of cancer.
* Spermatogenesis: The process of sperm production.
In essence, "-genesis" refers to the process by which something is created or comes into being.