1 definition found From WordNet (r) 2.0 [wn]: Bayer noun: 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 [syn: {aspirin}, {acetylsalicylic acid}, {Empirin}]

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