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Cyclic Vomiting Syndrome (Cvs): definition

Sudden, repeated attacks of severe vomiting, nausea, and physical exhaustion with no apparent cause that occur in children and adults, but more often in children. Attacks can last from a few hours to 10 days.… 

Endoscopy: definition

A procedure to inspect the hollow organs of upper digestive tract by use of an endoscope. An endoscope is a medical device consisting of a long, thin tube and an optical device. Observable organs include… 

Genome: definition

All the DNA contained in an organism or a cell, which includes both the chromosomes within the nucleus and the DNA in mitochondria.

Hepatitis D: definition

A virus that occurs mostly in people who share needles with infected people. Only people who have hepatitis B can get hepatitis D.

Hydrogen Breath Test: definition

A test for lactose intolerance that measures breath samples for hydrogen levels. The body makes too much hydrogen when lactose is not broken down properly in the small intestine.