Photism

//ˈfəʊtɪzəm// noun

Definitions

Noun
  1. 1
    The color that a synesthete may report seeing in association with a particular letter or number.
  2. 2
    A luminous appearance, image or subjective perception of a hallucinatory nature.

    "I refer to hallucinatory or pseudo-hallucinatory luminous phenomena, photisms, to use the term of the psychologists."

Etymology

From the stem of Ancient Greek φῶς (phôs, “light”) + -ism.

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