Omentectomy   

Removal of the fatty tissue that covers the abdominal organs.

 

Omentum

A layer of protective fatty tissue covering the abdominal organs like an apron.

 

Oncology

The study of cancer.

 

Oncologist

A doctor specialising in the treatment of cancer. A radiation oncologist deals with treatment with radiation and a medical oncologist specialises in treating patients with drugs such as chemotherapy.

 

Oophorectomy

Removal of one (unilateral) or both (bilateral) ovaries.

 

Ovary

A female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair.