What is Arms?

Legal Definition
Any thing that a man wears for his defence, or takes in his hands, or uses in his anger, to cast at, or strike at another. Co. Litt. 161 b, 162 a; Crompt. Just. P. 65; Cunn. Dict. h. t.

2. The Constitution of the United States, Amendm. art. 2, declares, "that a well regulated militia being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed." In Kentucky, a statute " to prevent persons from wearing concealed arms," has been declared to be unconstitutional; 2 Litt. R. 90; while in Indiana a similar statute has been holden valid and constitutional. 3 Blackf. R. 229. Vide Story, Const. – 1889, 1890 Amer. Citizen, 176; 1 Tuck. Black. App. 300 Rawle on Const. 125.
-- Bouviers Law Dictionary
Legal Definition
Heraldry. Signs of arms, or drawings painted on shields, banners, and the like. The arms of the United States are described in the Resolution of Congress, of June 20, 1782. Vide Seal of the United States.
-- Bouviers Law Dictionary
Legal Definition
Anything that a man wears for his defense or takes in his hands or uses in his anger, to cast at or strike at another. Co. Litt. 161b, 162a; State v. Buzzard, 4 Ark. 18.

This term, as it is used in the constitution, relative to the right of citizens to bear arms, refers to the arms of a militiaman or soldier, and the word is used in its military sense. The arms of the infantry soldier are the musket and bayonet; of cavalry and dragoons, the sabre, holster pistols, and carbine; of the artillery, the field-piece, siege-gun, and mortar, with side arms. The term, in this connection, cannot be made to cover such weapons as dirks, daggers, slung-shots, sword-canes, brass knuckles, and bowie-knives. These are not military arms. English V. State, 35 Tex. 476, 14 Am. Rep. 374; Hill v. Slate, 53 Ga. 472; Fife v. State, 31 Ark. 455, 25 Am. Rep. 556; Andrews v. State, 3 Heishi (Tenn.) 179, 8 Am. Rep. 8; Aymette v. State, 2 Humph. (Tenn.) 154.

Arms, or coat of arms, signifies insignia, i. e., ensigns of honor, such as were formerly assumed by soldiers of fortune, and painted on their shields to distinguish them; or nearly the same as armorial bearings, (q. v.)
-- Black's Law Dictionary
Legal Definition
Weapons.
-- Ballentine's Law Dictionary