The Collaborative International Dictionary of English v.0.48:

Morphine \Mor"phine\, n. [From Morpheus: cf. F. morphine.]
   (Chem.)
   A bitter white crystalline alkaloid found in opium,
   possessing strong narcotic properties, and much used as an
   anodyne; -- called also morphia, and morphina.
   [1913 Webster]

WordNet (r) 3.0 (2006):

morphine
    n 1: an alkaloid narcotic drug extracted from opium; a powerful,
         habit-forming narcotic used to relieve pain [syn:
         morphine, morphia]