from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A bitter crystalline alkaloid, C17H19NO3·H2O, extracted from opium, the soluble salts of which are used in medicine as an analgesic, a light anesthetic, or a sedative. Also called morphia.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A crystalline alkaloid (7,8-didehydro-4,5-epoxy-17-methyl-morphinan-3,6-diol), extracted from opium, the salts of which are soluble in water and are used as analgesics, anaesthetics and sedatives; it is one of a group of morphine alkaloids.

from the GNU version of the Collaborative International Dictionary of English

  • n. A bitter white crystalline alkaloid found in opium, possessing strong narcotic properties, and much used as an anodyne; -- called also morphia, and morphina.

from The Century Dictionary and Cyclopedia

  • n. An alkaloid, C17H19N03, the most important narcotic principle of opium.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain


French, from Morphée, Morpheus, from Latin Morpheus.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek Morpheus the god of dreams. (Wiktionary)


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  • Holmes used this in addition to cocaine.

    March 27, 2013