12 letters · 18 points in Scrabble
noun a sensation that normally occurs in one sense modality occurs when another modality is stimulated
originFrom Ancient Greek σύν (sún, “with”) + αἴσθησις (aísthēsis, “sensation”), modelled after anaesthesia. It is analysable as syn- + -aesthesia.
Etymology from Wiktionary, CC BY-SA 3.0