WordNet (r) 3.0 (2006):

Empirin
    n 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 [syn: aspirin, acetylsalicylic acid, Bayer,
         Empirin, St. Joseph]