Etymology
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armory (n.)

c. 1300, "arms and weapons collectively; defensive armor;" see arm (n.2) + -ory. Meaning "place where arms are manufactured" is from mid-15c. (see armor + -y (1)). Also used in a sense of "arsenal" (mid-15c.); the sense of "science of heraldry" (late 15c.) is from Old French armoierie, from armoier "to blazon," from Latin arma "weapons" (see arm (n.2)).

updated on February 11, 2017

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Definitions of armory from WordNet

armory (n.)
a collection of resources;
he dipped into his intellectual armory to find an answer
Synonyms: armoury / inventory
armory (n.)
all the weapons and equipment that a country has;
Synonyms: arsenal / armoury
armory (n.)
a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms;
Synonyms: arsenal / armoury
armory (n.)
a place where arms are manufactured;
Synonyms: armoury / arsenal
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.