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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 2. (Pharm.) Kept in stock by apothecaries; -- said of such drugs and medicines as may be obtained without special preparation or compounding; not magistral. [1913 Webster] Note: This term is often interchanged with official, but in strict use officinal drugs are not necessarily official. See Official, a., 3. [1913 Webster]