AIDS

From DictionGloss

AIDS (Acquired Immunodeficiency Syndrome): A condition characterized by a defect in the body's natural immunity to diseases. Individuals who suffer from it are at risk for severe illnesses that are usually not a threat to anyone whose immune system is working properly.

This disease hurts the immune system, (the body’s way of protecting itself), so that it becomes easy to get dangerous infections and cancers. It is caused by the HIV infection.