The Collaborative International Dictionary of English v.0.48:

acetophenetidin \acetophenetidin\ n. (Med.)
   A white crystalline compound used as an analgesic and also as
   an antipyretic.

   Syn: acetphenetidin, phenacetin
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

acetophenetidin
    n 1: a white crystalline compound used as an analgesic and also
         as an antipyretic [syn: acetophenetidin,
         acetphenetidin, phenacetin]