Source : Webster's Revised Unabridged Dictionary (1913)

Officinal \Of*fic"i*nal\, a. [F., fr. L. officina a workshop,
   contr.fr. opificina, fr. opifex a workman; opus work + facere
   to make or do.]
   1. Used in a shop, or belonging to it. [Obs. or R.]
      --Johnson.

   2. (Pharm.) Kept in stock by apothecaries; -- said of such
      drugs and medicines as may be obtained without special
      preparation or compounding; not magistral.

   Note: This term is often interchanged with official, but in
         strict use officinal drugs are not necessarily
         official. See {Official}, a., 3.