barbiturate has definitions from the fields of medicine,pharmacology
1
[ noun ] (medicine,pharmacology) organic compound having powerful soporific effect; overdose can be fatal

Used in print

(E. Gellhorn, "Prolegomena to a theory of the emotions"...)

On_the_other_hand , the temporary reduction in hypothalamic excitability through the injection of a barbiturate into the posterior hypothalamus causes a lessening in frequency and amplitude of cortical strychnine spikes until the hypothalamic excitability is restored .

*