The Collaborative International Dictionary of English v.0.48:

Narcotic \Nar*cot"ic\ (n[aum]r*k[o^]t"[i^]k), a. [F. narcotique,
   Gr. narkwtiko`s, fr. narkoy^n to benumb, na`rkh numbness,
   torpor.] (Med.)
   Having the properties of a narcotic; operating as a narcotic.
   [1913 Webster] -- Nar*cot"ic*ness, n.
   [1913 Webster]