synesthesia

noun3

1. •
   A neurological or psychological phenomenon whereby a particular sensory stimulus triggers a second kind of sensation.

   • […] R. H. Gault's case of synesthesia in a deaf and blind girl, who could distinguish colors by the sense of smell, […] — 1926
2. •
   The association of one sensory perception with, or description of it in terms of, a different perception that is not experienced at the same time.
3. •
   A literary or artistic device whereby one kind of sensation is described in the terms of another.