Origin: 1300–50;Middle Englisharmerie, armur(i)e < Middle Frencharmoierie, equivalent to Old Frencharmoi(er) to bear arms (derivative of armesarm2) + -erie-ery
"place where arms are manufactured," 1841, Amer.Eng., from arm (2). Earlier, "arsenal" (1530s) and "the science of heraldry" (late 15c.), from O.Fr. armoierie, from armoier "to blazon," from L. arma "weapons."