subatomic particle
noun/ˌsʌbəˌtɒmɪk ˈpɑːtɪkl/
/ˌsʌbəˌtɑːmɪk ˈpɑːrtɪkl/
(physics)- a very small piece of matter, such as an electron or a proton, that is smaller than an atom compare elementary particle
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subatomic particle