In physics, a counterpart or opposite component that is paired with another part; specifically used in discussions of antiparticles and antimatter.
From anti- (opposite) + part (from Latin pars). This is a physics term that emerged with modern quantum theory to describe corresponding but opposite components of matter.
While 'antipart' is somewhat poetic, physicists more often say 'antiparticle'—but the concept is wild: for every electron there's a positron that has the same mass but opposite charge, and they annihilate each other in a burst of pure energy.
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