Go back to the index of this complete glossary to find the definition of all medical terms for cancers, treatments and health.

 

 

 

• Gallbladder : A small organ that stores bile. It is located below the liver. 
   
• Gamma rays : Same as x-rays but from a different radioactive source. 
   
• Gastrointestinal tract : The digestive tract, where the body processes and uses food. It includes the esophagus, stomach, liver, small and large intestines, and rectum. 
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• Gastroenterologist : A doctor who specializes in diagnosing and treating diseases of the digestive system. 
   
• Gene therapy : Treatment that alters genes (the basic units of heredity found in all cells in the body.  
   
• Genetic : Relating to genes or inherited characteristics. 
   
• Germ cell tumors : A type of brain tumor. 
   
• Germinoma : A type of germ cell tumor. 
   
• Gland : An organ that produces and releases one or more substances.  
   
• Gliblastoma multiforme : A type of brain tumor. 
   
• Glioma : A name for brain tumors that begin in the glial cells, or supportive cells, in the brain. "Glia" is the Greek word for glue. 
   
• Graft : Healthy skin, bone, or other tissue taken from one part of the body to replace diseased or injured tissue removed from another part of the body.