"Antimatter" a misnomer? This is my first post on PF. Hello all. Noting the fact that antimatter has a positive inertial mass and probably an equal, positive gravitational mass, isn't the term a misnomer? I know it has an opposite electrical charge and magnetic moment compared to normal matter, which means the two are partially eachothers opposites. However, I feel it is a stretch to call them mirror images of eachother. Antimatter can indeed annihilate with ordinary matter, but this makes new particles, sometimes even massive ones, rather than the two cancelling eachother out. I therefore propose that what is now called antimatter should really be called "complementary matter" or "Dirac matter". I'm suggesting this renaming scheme because it's conceivable that one day "true" antimatter with a negative mass may be discovered or predicted in some theoretical framework. What would you call this stuff then? Discuss.