[sin-uhs-thee-zhuh, -zhee-uh, -zee-uh]
a sensation produced in one modality when a stimulus is applied to another modality, as when the hearing of a certain sound induces the visualization of a certain color.

1890–95; < Neo-Latin; see syn-, esthesia

synesthete [sin-uhs-theet] , noun
synesthetic [sin-uhs-thet-ik] , adjective
nonsynesthetic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synaesthesia or synesthesia (ˌsɪniːsˈθiːzɪə)
1.  physiol a sensation experienced in a part of the body other than the part stimulated
2.  psychol the subjective sensation of a sense other than the one being stimulated. For example, a sound may evoke sensations of colour
[from New Latin, from syn- + -esthesia, from Greek aisthēsis sensation]
synesthesia or synesthesia
[from New Latin, from syn- + -esthesia, from Greek aisthēsis sensation]
synaesthetic or synesthesia
synesthetic or synesthesia

synesthesia (ˌsɪniːsˈθiːzɪə)
the usual US spelling of synaesthesia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

synesthesia syn·es·the·sia (sĭn'ĭs-thē'zhə)

  1. A condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color.

  2. A sensation felt in one part of the body as a result of stimulus that is applied to another, as in referred pain.

syn'es·thet'ic (-thět'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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Encyclopedia Britannica


a condition in which one type of sensory stimulation creates perception in another sense. The most common form of synesthesia is called "coloured hearing," where a person experiences a visual sensation when receiving an auditory signal (for example, hearing the musical tone C and seeing the colour red). Although tone-colour relationships are not identical for all people, there are general uniformities: the deeper a musical note, the darker the colour. Similar colour perceptions, called photisms, may accompany sensations of taste, touch, pain, smell, or temperature. Synesthesia has been used as a literary device by poets as diverse as Edgar Allan Poe, Arthur Rimbaud, Hart Crane, and Dame Edith Sitwell.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He suffered a series of early epileptic fits that he believes brought on his synesthesia.
People with synesthesia often have strong feelings about the qualities of various words or letters.
New research suggests people with synesthesia may be better problem solvers.
It has also provided suggestive insights into the physiological cause of such
  mystifying syndromes as synesthesia and autism.
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