Definition of opiates:
(n) :
(pharmacology) A drug, hormone or other substance derived from or related to opium.
(adj) :
(pharmacology) Relating to, resembling, or containing opium.
(adj) :
Soporific; inducing sleep or sedation.
(n) :
Something that dulls the senses and induces a false and unrealistic sense of contentment.
(adj) :
Deadening; causing apathy or dullness.
(v) :
(transitive) To treat with an opiate drug.