Definify.com
Webster 1913 Edition
Armory
Ar′mo-ry
,Noun.
pl. 
Armories
. 1. 
A place where arms and instruments of war are deposited for safe keeping. 
2. 
Armor; defensive and offensive arms. 
Celestial 
armory
, shields, helms, and spears. Milton.
3. 
A manufactory of arms, as rifles, muskets, pistols, bayonets, swords. 
[U.S.] 
4. 
Ensigns armorial; armorial bearings. 
Spenser.
 5. 
That branch of heraldry which treats of coat armor. 
The science of heraldry, or, more justly speaking, 
armory
, which is but one branch of heraldry, is, without doubt, of very ancient origin. Cussans.
Webster 1828 Edition
Armory
'ARMORY
, n.1.
  A place where arms, and instruments of war are deposited for safe keeping.2.
  Armor; defensive arms.3.
  Ensigns armorial.4.
  The knowledge of coat-armor; skill in heraldry.