What is the meaning of Atom-?

A-; (nuclear power)

nuclear, atomic

atomic; of or related to radioactivity

nuclear

1. of or related to the production of nuclear energy

   of or related to the production of nuclear energy

   which utilizes the energy or explosive power of nuclear fission

   which is the result of the production of nuclear energy

   nuclear

   atomic, nuclear

   Source: wiktionary.org