Source : Webster's Revised Unabridged Dictionary (1913)

Acetanilide \Ac`et*an"i*lide\, n. [Acetyl + anilide.] (Med.)
   A compound of aniline with acetyl, used to allay fever or
   pain; -- called also {antifebrine}.

Source : WordNet®

acetanilide
     n : a white crystalline compound used as an analgesic and also
         as an antipyretic [syn: {acetanilid}, {phenylacetamide}]