The antimatter counterpart of an electron, also known as a positron, which has the same mass as an electron but opposite electric charge.
From anti- (prefix meaning opposite) + electron (from Greek elektron, meaning amber). The term was coined in the early 20th century when physicists discovered antimatter particles.
When an antielectron meets an electron, they annihilate each other in a burst of pure energy—this is one of the few ways matter can be completely converted to energy, exactly as Einstein's E=mc² predicts.
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