1. 核能的；原子能的
Atomic means relating to power that is produced from the energy released by splitting atoms.

2. 原子的;与原子有关的
Atomic means relating to the atoms of substances.

1. (weapons) deriving destructive energy from the release of atomic energy

e.g. nuclear war
nuclear weapons
atomic bombs

Synonym: nuclear

2. immeasurably small

3. of or relating to or comprising atoms

e.g. atomic structure
atomic hydrogen