Pertaining to particles making up the intraatomic structure; e.g., protons, electrons, neutrons.
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sub·atom·ic .səb-ə-'täm-ik adj
1) of or relating to the inside of the atom
2) of, relating to, or being particles smaller than atoms
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sub·atom·ic (sub″ə-tomґik) 1. smaller than an atom or occurring within an atom. 2. of or pertaining to the constituent parts of an atom as considered under the theory of the nuclear atom.Medical dictionary. 2011.