'major tranquilliser' definitions:

Definition of 'major tranquilliser'

(from WordNet)
noun
Tranquilizer used to treat psychotic conditions when a calming effect is desired [syn: major tranquilizer, major tranquillizer, major tranquilliser, antipsychotic drug, antipsychotic agent, antipsychotic, neuroleptic drug, neuroleptic agent, neuroleptic]