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(synæsthesia, synaesthesia)

Usually used in the plural, synesthesias refers to the experience of sensation in a secondary sensory modality that is triggered by a stimulus in the primary modality. For example, seeing the color red might produce a smell of cinnamon, a chromatism. These are further named by the secondary modality as phonisms, photisms, olfactisms, gustatisms, etc.

Books, etc.