Source : Webster's Revised Unabridged Dictionary (1913)

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}.

Source : WordNet®

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