ETYM From Morpheus: cf. French morphine.
Narcotic alkaloid C17H19NO3 derived from opium and prescribed only to alleviate severe pain. Its use produces serious side effects, including nausea, constipation, tolerance, and addiction, but it is highly valued for the relief of the terminally ill.
An alkaloid extracted from opium; a powerful, habit-forming narcotic used to relieve pain; SYN. morphia.