variants:
or sub-visual
Definition of subvisual
: not visible without the aid of special instruments : subvisible
… once you have seen the subvisual world through the microscope, you stop inventing demons and magic as the agents of change.— Dava Sobel Auroras have a wide range of brightness, usually rated from 0 to 4 on a logarithmic scale … in which each number is 10 times brighter than the previous one. Zero means subvisual, detected only with instruments.— Robert H Eather
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Merriam-Webster unabridged
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Time Traveler for subvisual
The first known use of subvisual was in 1873
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