'Stupefacient' definitions:

Definition of 'Stupefacient'

From: GCIDE

Stupefacient \Stu`pe*fa"cient\, a. [L. stupefaciens, p. pr. of stupefacere to stupefy; stupere to be stupefied + facere to make. Cf. Stupefy.] [Written also stupifacient.] Producing stupefaction; stupefactive. -- n. (Med.) Anything promoting stupefaction; a narcotic. [1913 Webster]