D defs.my
Entry 1 sense Webster, 1913

Photism

/(fō"tĭz'm)/ · Pho·tism · IPA /ˈfəʊtɪzəm/
01 n. A luminous image or appearance of a hallucinatory character.
  1. 1.
    A luminous image or appearance of a hallucinatory character.(Psycol.)