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

Similar word(s): thermonuclear, nuclear

3. immeasurably small

Similar word(s): little, small

Sentences with atomic as an adjective:

- A stream of atomic hydrogen is emitted

- We built a small atomic bomb in the garage

- The hairs on a bedbug are almost atomic

- A bit is an atomic item of data

- In order to avoid race conditions, this operation has to be atomic