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Adjective: atomic  u'tó-mik
  1. Of or relating to or comprising atoms
    "atomic structure"; "atomic hydrogen"
     
  2. (weapons) deriving destructive energy from the release of atomic energy
    "atomic bombs";
    - nuclear
     
  3. Immeasurably small
     
  4. Unable to be split or made any smaller
    "A bit is an atomic item of data"

See also: little, small, thermonuclear

Encyclopedia: Atomic, molecular, & optical physics