Definify.com
Webster 1913 Edition
Stupefacient
Stuˊpe-fa′cient
,Adj.
[L.
stupefaciens
, p. pr. of stupefacere
to stupefy; stupere
to be stupefied + facere
to make. Cf. Stupefy
.] [Written also
stupifacient
.] Producing stupefaction; stupefactive.
– Noun.
(Med.)
Anything promoting stupefaction; a narcotic.