acetylsalicylic acid acetylsalicylic acid /əˌsɛtəlˌsælɪˈsɪlɪk ˈæsɪd/

noun

1. The acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets  ( acetylsalicylic acid , Bayer , Empirin , aspirin , St. Joseph )
   the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets
    After a long day, she took an aspirin to alleviate her headache.
   After a long day, she took an aspirin to alleviate her headache.