from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. A luminous image or appearance of a hallucinatory character.

from The Century Dictionary and Cyclopedia

  • n. In psychology, a reproduced sensation of color regularly accompanying the arousal of sensation in certain other sense departments, especially in that of hearing: the commonest form of synæsthesia.


From the stem of Ancient Greek φῶς ("light") + -ism. (Wiktionary)


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