The Collaborative International Dictionary of English v.0.48:

Datril \Datril\ n.
   an analgesic derived from acetanolide; also used as an
   antipyretic; Datril and Tylenol are trademarks of brands of
   acetaminophen tablets. See acetaminophen.

   Syn: acetaminophen, Tylenol.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Datril
    n 1: an analgesic for mild pain but not for inflammation; also
         used as an antipyretic; (Datril, Tylenol, Panadol,
         Phenaphen, Tempra, and Anacin III are trademarks of brands
         of acetaminophen tablets) [syn: acetaminophen, Datril,
         Tylenol, Panadol, Phenaphen, Tempra, Anacin III]