Meaning

noun 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 clotti

originGenericized trademark of German Aspirin, from acetylierte Spirsäure (literally “acetylated spiraeic acid”). The trade name Aspirin is a registered trademark in some countries, but has entered the English language in generic usage, as various German trademarks were nullified in the United States after World War I (see also heroin).

Etymology from Wiktionary, CC BY-SA 3.0