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. Spensplw. 5. That branch of hplwaldry which treats of coat armor. ...