Pronunciation: (môr'fēn), [key]
a white, bitter, crystalline alkaloid, C17H19NO3·H2O, the most important narcotic and addictive principle of opium, obtained by extraction and crystallization and used chiefly in medicine as a pain reliever and sedative. Also,mor•phi•aPronunciation: (môr'fē-u). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.