Source : Webster's Revised Unabridged Dictionary (1913)

Armorer \Ar"mor*er\, n. [OE. armurer, armerer, fr. F. armurter,
   fr. armure armor.]
   1. One who makes or repairs armor or arms.

   2. Formerly, one who had care of the arms and armor of a
      knight, and who dressed him in armor. --Shak.

   3. One who has the care of arms and armor, cleans or repairs
      them, etc.

Source : WordNet®

armorer
     n 1: an enlisted man responsible for the upkeep of small arms and
          machine guns etc. [syn: {armourer}, {artificer}]
     2: a manufacturer of firearms [syn: {armourer}]