Definition of acetylsalicylic acid
: a white crystalline derivative C9H8O4 of salicylic acid used for relief of pain and fever : aspirin sense 1 Aspirin is acetylsalicylic acid and is based on salicylic acid, which was originally extracted from willow bark. — Berkeley Wellness Letter Episodes are often precipitated by the ingestion of alcohol and chocolate and do not occur after exercise or the use of acetylsalicylic acid as in this patient.— Mandakolathur R. Murali et al.
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