morphia n an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain Usage(s) He, vexed, indulged himself the more riotously, inhaled ether and took morphia when he found that champagne had no more effect upon him. He treated himself with an "electrical contraption called Pulvermacher's Galvanic Belt," added morphia and colchicum to his diet of drugs. Synonym(s) morphine