/ əˈtɒmɪk; NAmE əˈtɑːmɪk/ adjective [ usually before noun ]
1.
connected with atoms or an atom :
atomic structure
2.
related to the energy that is produced when atoms are split; related to weapons that use this energy :
atomic energy / power
the atomic bomb
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WORD ORIGIN
late 17th cent.: from modern Latin atomicus , from atomus indivisible from Greek atomos , based on a- not + temnein to cut.