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Douglas Harper's Etymology Dictionary
sub-atomic

also subatomic, 1874, from sub-atom (1868, from sub- + atom) + -ic.

Wiktionary
sub-atomic

a. (alternative spelling of subatomic English)

Usage examples of "sub-atomic".

Plasma photon ionizers utilizing a cross-polarization of beta particles to bombard an inter-rositor through the medium of a sub-atomic converter?

But the field of sub-atomic studies was looking increasingly mined out, and the quantum Standard Model had not had a good paradigm-shattering kick in the pants in some time.

And the development itself will in all probability be an outgrowth of thermionics, which is the branch of science which deals with the influence of heat on matter in generating atomic or sub-atomic electrically charged particles, ions and electrons.

My work has always been involved with the theory of particle movement, sub-atomic particles that is, and their relation to the unified field theory&hellip.

These days all formats worked on the sub-atomic level, by manipulating the weak nuclear interaction, intercepting neutrinos, processing exotic artificial particles, or even tapping the source of true randomness below the quantum level.