Aspirin:

—Acetylsalicylic acid. Long used to treat pain, fevers, and inflammation, aspirin is also known to prevent platelets from clumping in the process of blood clot formation. As a result, studies have shown that small, regular doses of aspirin may help prevent heart attacks in: 1) people who have ischemic heart disease, 2) people who are recovering from coronary artery bypass graft surgery, and 3) people who have no symptoms but are at high risk. Aspirin is also used to prevent strokes and TIAs is people who have been diagnosed with cardiovascular disease. 

Acetylsalicylic acid (ASP); aspirin and other products containing ASP should not be used by people with bleeding disorders since ASA slows the clotting process. 

A medication that decreases platelet funtion. 

the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer and Empirin) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets