What is the definition or description of: bacterial endocarditis?

A heart infection...: ...Usually involving a bacteria (or sometimes a fungus) which attach to diseased or artificial heart valves. The bacteria usually get into the bloodstream from dental or other surgical procedures, but may enter through an inadvertent event. This is a very serious infection, requiring hospitalization, and often weeks of intravenous antibiotics.

Heart infection: Bacterial endocarditis is an infection of the innermost lining of the heart muscle, the endocardium, by any of a variety of bacterial organisms. Often, bacterial endocarditis occurs in patients with existing structural heart conditions such as abnormal cardiac valves or abnormal communications between heart chambers. The bacteria may be introduced into the bloodstream during invasive procedures.