The Collaborative International Dictionary of English v.0.48:

acetphenetidin \acetphenetidin\ n.
   1. a white crystalline compound used as an analgesic and also
      as an antipyretic.

   Syn: acetophenetidin, phenacetin
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

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