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English word arm comes from Proto-Indo-European *h₂(e)rmos, Old French (842-ca. 1400) armes, and later Old French (842-ca. 1400) arme (Weapon.)
*h₂(e)rmos (Proto-Indo-European)
fitting
armes (Old French)
arma (Latin)
(Late Latin) weapon. (pluralonly) defence. (pluralonly) defensive arms, armor/armour, shields, weapons of war.. (pluralonly) soldiers, military power. (pluralonly) tools. (pluralonly) war.
arma (Late Latin)
arme (Old French)
Weapon.
armes (Middle English)
arm (English)
(figurative) To furnish with means of defence; to prepare for resistance; to fortify, in a moral sense.. To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency.. To fit (a magnet) with an armature.. To prepare a tool or a weapon for action; to activate.. To supply with armour or (later especially) weapons. (in the plural) heraldic bearings or [...]