idiopathic synesthesia pronunciation: ih-dee-oh-PATH-ick part of speech: noun definition: the true, natural form of synesthesia; it has a childhood (or earlier) onset, it is not drug-induced, it is vivid, it is automatic/involuntary, and it is, for the most part, unlearnt notes: the original form of a synesthesia type, such as chromagraphemia, has early childhood onset; however, graphemes learned later for that synesthete can acquire regular synesthetic qualities (those qualities can be either arbitrary or learned) also known as: — see:  — see also:  developmental synesthesia mixsig home ¤ copyright ¤ close