a white, crystalline organic substance, CHNHCOCH, produced by the action of acetic acid on aniline: it is used as a drug to lessen pain and fever, in making dyes, etc.
See acetanilide in American Heritage Dictionary 4
(ăsˌĭt-ănˈl-īdˌ) also ac·et·an·i·lid(-ănˈl-ĭd)
noun
A white crystalline compound, C6H5NH(COCH3), formerly used in medicine to relieve pain and reduce fever. It has been replaced by safer agents because of its toxicity.