medical definition of disease
disease. noun disÂ·ease \di-ËzÄz\. Tweet. : an illness that affects a person, animal, or plant: a condition that prevents the body or mind from working normally.: a problem that a person, group, organization, or society has and cannot stop.xamples of DISEASE. 1  He suffers from a rare genetic disease. 2  a disease of the mind. 3  Thousands die of heart disease each year. 4  They are working to stop the spread of disease in rural areas. 5  The article cites intolerance as one of the most dangerous of society's diseases.
Medical Definition of INFECTIOUS DISEASE. : a disease caused by the entrance into the body of organisms (as bacteria, protozoans, fungi, or viruses) which grow and multiply thereâsee communicable disease, contagious disease.edical Definition of INFECTIOUS DISEASE. : a disease caused by the entrance into the body of organisms (as bacteria, protozoans, fungi, or viruses) which grow and multiply thereâsee communicable disease, contagious disease.