subatomic

Pronunciation: /ˌsʌbəˈtɒmɪk/

The English word “subatomic” has 2 meanings listed here.

adjective

Relating to particles that are constituents of the atom, or are smaller than an atom; such as proton, neutron, electron, etc.
Relating to something that is smaller in scale than the diameter of a hydrogen atom.

From sub- + atomic.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.