subatomic

  1. Adjective.  (physics) Relating to particles that are constituents of the atom, or are smaller than an atom; such as proton, neutron, electron, etc.
  2. Adjective.  Relating to any length or mass that is smaller in scale than a the diameter of a hydrogen atom.

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This entry was last updated on RefTopia from its source on 3/20/2012.