Commentary Inf V 28

It has become fashionable to speak of Dante's use of 'synaesthesia,' the blending of different sense impressions (see, e.g., Camb.1970.1). The term, however, was coined some 500 years later in literary history. Dante would perhaps have referred to the trope rather as 'catachresis,' a daring, even 'improper,' comparison. See Holl.1983.1, pp. 66-67. And see [Inf I 60] for a prior example.