"Moment" is a perfectly acceptable English term for the product of a force and a distance; the three non-force components used in aircraft six degree of freedom modelling are normally called "pitching moment", "rolling moment" and "yawing moment" - and it's the balance of the yawing moment due to the thrust asymmetry with the aerodynamic yawing moment arising mainly - but NOT solely - from the rudder that is important in most VMC considerations.
Incidentally, the attempts to compare VMCA and VMCG which I've seen earlier in this thread are somewhat misplaced. There is NO specific relationship between the two, as the conditions for the determination of the two speeds are very different aerodynamically, and either VMCA or VMCG may be higher or lower depending on the specifics of the aircraft - and even of the configuration.