Definition of photism in English:

photism

noun

Psychology
  • A hallucinatory sensation or vision of light.

    • ‘The idea was that if a photism was an automatic consequence of letter identification, then the photism should interfere with naming the ink colour of these letters on incongruent cards.’
    • ‘The first painting in which I consciously recorded a photism that I saw during an acupuncture session, called Vision (Fig. 1), was created in 1996.’

Origin

Late 19th century: from Greek phōtismos, from phōtizein ‘to shine’, from phōs, phōt- ‘light’.

Pronunciation

photism

/ˈfəʊtɪz(ə)m/