Etymology
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morphine (n.)

chief alkaloid of opium (used as a narcotic pain-killer), 1828, from French morphine or German Morphin (1816), name coined by German apothecary Friedrich Sertürner (1783-1840) in reference to Latin Morpheus (q.v.), Ovid's name for the god of dreams, from Greek morphē "form, shape, beauty, outward appearance," which is of unknown origin. So called because of the drug's sleep-inducing properties.

updated on February 23, 2019

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Definitions of morphine from WordNet

morphine (n.)
an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain;
Synonyms: morphia
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.