synesthetic

/S IH1 N AH0 S TH EH1 T IH0 K/
adjective
  1. 1

    (of a person) experiencing synaesthesia; describing a synaesthete.

    โ€œLiz said that her name looks yellow, so I assume sheโ€™s synaesethetic.โ€

  2. 2

    Pertaining to synaesthesia.

    โ€œOne of the most common synaesthetic effects is to perceive each letter as having a colour.โ€

Source: https://en.wiktionary.org/wiki/synaesthetic, https://en.wiktionary.org/wiki/synesthetic