Source : Webster's Revised Unabridged Dictionary (1913)

Gorget \Gor"get\, n. [OF. gorgete, dim. of gorge throat. See
   {Gorge}, n.]
   1. A piece of armor, whether of chain mail or of plate,
      defending the throat and upper part of the breast, and
      forming a part of the double breastplate of the 14th
      century.

   2. A piece of plate armor covering the same parts and worn
      over the buff coat in the 17th century, and without other
      steel armor.

            Unfix the gorget's iron clasp.        --Sir W.
                                                  Scott.

   3. A small ornamental plate, usually crescent-shaped, and of
      gilded copper, formerly hung around the neck of officers
      in full uniform in some modern armies.

   4. A ruff worn by women. [Obs.]

   5. (Surg.)
      (a) A cutting instrument used in lithotomy.
      (b) A grooved instrunent used in performing various
          operations; -- called also {blunt gorget}.
          --Dunglison.

Source : WordNet®

gorget
     n : armor plate that protects the neck