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- n. Plural form of photism.
Sorry, no etymologies found.
This last phenomenon is perhaps akin to the luminous visions, called photisms by psychologists, which not infrequently accompany conversion and other religious experiences and take the form of flashes or rays proceeding from material objects .
I suspected there was something deep and metaphysical happening behind these waves of magenta, persimmon and indigo lighted "photisms" synesthetes see and he seemed to agree.
Such reports of photisms are indeed far from uncommon.
I refer to hallucinatory or pseudo-hallucinatory luminous phenomena, photisms, to use the term of the psychologists.