subatomic

(sub′ə tämik)

adjective

Particle Physics of or pertaining to the inner part of an atom or to a particle, as an elementary particle or hadron, that is smaller than an atom

See subatomic in American Heritage Dictionary 4

adjective
  1. Of or relating to particles that are smaller than an atom.
  2. Having dimensions or participating in reactions characteristic of the constituents of the atom.

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