aspirin - definition of aspirin by The Free Dictionary
as·pi·rin (ăs′pər-ĭn, -prĭn) n. pl. aspirin or as·pi·rins 1. A white, crystalline compound, C 9 H 8 O 4, derived from salicylic acid and commonly used in tablet form to relieve pain and reduce fever and inflammation. It is also used as an antiplatelet age...