(n) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush, Syn. diacetylmorphine
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. [ From Morpheus: cf. F. morphine. ] (Chem.) A bitter white crystalline alkaloid found in opium, possessing strong narcotic properties, and much used as an anodyne; -- called also morphia, and morphina. [ 1913 Webster ]