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From The Collaborative International Dictionary of English v.0.48:
Arms \Arms\, n. pl. [OE. armes, F. arme, pl. armes, fr. L. arma, pl., arms, orig. fittings, akin to armus shoulder, and E. arm. See Arm, n.] 1. Instruments or weapons of offense or defense. [1913 Webster] He lays down his arms, but not his wiles. --Milton. [1913 Webster] Three horses and three goodly suits of arms. --Tennyson. [1913 Webster] 2. The deeds or exploits of war; military service or science. "Arms and the man I sing." --Dryden. [1913 Webster] 3. (Law) Anything which a man takes in his hand in anger, to strike or assault another with; an aggressive weapon. --Cowell. Blackstone. [1913 Webster] 4. (Her.) The ensigns armorial of a family, consisting of figures and colors borne in shields, banners, etc., as marks of dignity and distinction, and descending from father to son. [1913 Webster] 5. (Falconry) The legs of a hawk from the thigh to the foot. --Halliwell. [1913 Webster] Bred to arms, educated to the profession of a soldier. In arms, armed for war; in a state of hostility. Small arms, portable firearms known as muskets, rifles, carbines, pistols, etc. A stand of arms, a complete set for one soldier, as a musket, bayonet, cartridge box and belt; frequently, the musket and bayonet alone. To arms! a summons to war or battle. Under arms, armed and equipped and in readiness for battle, or for a military parade. [1913 Webster] Arm's end, Arm's length, Arm's reach. See under Arm. [1913 Webster]