anorexia
Anorexia is a serious mental disease in which the patient has a sensation of feeling overweight, when in reality they are thin. For this reason, they stop eating, and in some severe cases, starve to death.
antibiotic
An antibiotic is a medicine made from tiny bugs or microbes (called bacteria), which cures diseases that are also caused by bacteria, such as ear infections or pneumonia.
antibody
An antibody is a chemical substance (called protein) that your body produces to defend itself against foreign and destructive elements, such as bacteria, fungi or viruses, or against chemicals that are bad for your body.
antiseptic
An antiseptic is a substance used to clean wounds when they are infected, or to prevent them from getting infected.
appendicitis
Appendicitis is a disease in which the appendix, a small, thin, finger-like pouch, attached to the beginning of the large intestine, becomes inflamed.