antiparticle
noun/ˈæntipɑːtɪkl/
/ˈæntipɑːrtɪkl/, /ˈæntaɪpɑːrtɪkl/
(physics)- a very small part of an atom that has the same mass as a normal particle but the opposite electrical charge
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antiparticle
Definition of antiparticle noun from the Oxford Advanced Learner's Dictionary
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