Definition of "synaesthesia" [synaesthesia]

• Variant of synesthesia. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The first time I encountered the term synaesthesia was when I studied the French Symbolist poets -- Baudelaire, Verlaine, Rimbaud and company -- back in college."
• "Genetic Roots of Synaesthesia Unearthed - I've always been interested in synaesthesia (here's a past post on the subject)."
• "I read an article (in the Washington Post? perhaps.) on a conference about synaesthesia which said that a quick test psych people to to see of someone has synaesthesia is asking them "What shape is a year?""