The Collaborative International Dictionary of English v.0.48:

ibuprofen \ibuprofen\ n.
   a nonsteroidal anti-inflammatory medicine used to relieve the
   pain of arthritis and as an analgesic and antipyretic;
   Advil and Motrin and Nuprin are trademarks of brands of
   ibuprofen tablets.

   Syn: isobutylphenyl propionic acid, Advil, Motrin, Nuprin.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Motrin
    n 1: a nonsteroidal anti-inflammatory and analgesic medicine
         (trade names Advil and Motrin and Nuprin) used to relieve
         the pain of arthritis and as an antipyretic; "daily use of
         ibuprofen can irritate the stomach" [syn: ibuprofen,
         isobutylphenyl propionic acid, Advil, Motrin,
         Nuprin]