təˈraksēə̇n noun
( -s )
Etymology: Greek tarax is confusion (from tarassein to trouble, confuse) + English -ein (as in protein ); akin to Greek thrassein, thrattein to trouble, disturb — more at dark
: a substance isolable from the blood of schizophrenic persons, capable of inducing transitory schizophrenic symptoms in normal individuals, and believed to act upon a specific enzyme