This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or relating to particles that are smaller than an atom.

adj. Having dimensions or participating in reactions characteristic of the constituents of the atom.

adj. Relating to particles that are constituents of the atom, or are smaller than an atom; such as proton, neutron, electron, etc.

adj. Relating to any length or mass that is smaller in scale than a the diameter of a hydrogen atom.

Of or pertaining to the relations of assumed particles or subdivisions of matter smaller than the atom: as, subatomic energy.

adj. of smaller than atomic dimensions

adj. of or relating to constituents of the atom or forces within the atom

"The absurdity grows even more palpable among astrophysicists who avoid acknowledging the human-friendly pattern in subatomic and cosmic architecture found in the observable universe only by theorizing the existence of an infinite number of unobservable universes in which sovereign randomness has dictated other and more hostile architectures."

little    small   

subatomic particle    subatomically    atomic   

Islamic    atomic    autonomic    comic    diatomic   

etheric    sub-atomic    chroniton    tetryon    gravitic