/as"peuhr in, -prin/ , n. , pl. aspirin, aspirins .
1. Pharm. a white, crystalline substance, C 9 H 8 O 4 , derivative of salicylic acid, used as an anti-inflammatory agent and to relieve the pain of headache, rheumatism, gout, neuralgia, etc.; acetylsalicylic acid.
2. an aspirin tablet: I took two aspirin and went right to bed.
[ 1899; orig. G trademark, equiv. to A ( cetyl ) ACETYL + Spir ( säure ) salicylic acid (see SPIRAEA) + -in -IN 2 ]