comrade in arms (fellow combatant or soldier)

plural of armed robbery

(law) An theft where the thieves are carrying weapons.

(physics) The perpendicular distance from a pivot to a point undergoing torque

plural of brother-in-arms

plural of tone arm

One of the three chief heralds of the College of Arms, designated as Garter (Principal King of Arms), Clarenceux (for England south of the Trent and Wales), and Norroy & Ulster (for England north of the Trent and Northern Ireland).

(automotive) A nearly flat and roughly triangular suspension member that pivots in two places.

plural of sword arm

Restrictions upon the development, production, stockpiling, proliferation, and usage of weapons, especially weapons of mass destruction.