(uncountable) A yellow-brown, addictive narcotic drug obtained from the dried juice of unripe pods of the opium poppy, Papaver somniferum, and containing alkaloids such as morphine, codeine, and papaverine.

plural of opium

(dated) opium addiction

morphine alkaloid

Lactucarium.

plural of opium poppy

Papaver somniferum, the species of plant from which opium and poppy seeds are extracted.

(medicine, archaic) A solution of opium in aromatized sherry.

plural of Opium War

(historical) The First Opium War or the Second Opium War, two Anglo-Chinese disputes in the mid-19th century.