Source : Webster's Revised Unabridged Dictionary (1913)

Magistery \Mag"is*ter*y\, n. [L. magisterium the office of a
   chief, president, director, tutor. See {Magistrate}.]
   1. Mastery; powerful medical influence; renowned efficacy; a
      sovereign remedy. [Obs.] --Holland.

   2. A magisterial injunction. [R.] --Brougham.

   3. (Chem.) A precipitate; a fine substance deposited by
      precipitation; -- applied in old chemistry to certain
      white precipitates from metallic solutions; as, magistery
      of bismuth. --Ure.