chiton Syllabification: (chi·ton)Pronunciation: /ˈkītn, ˈkīˌtän/Definition of chiton noun 1a long woolen tunic worn in ancient Greece. [from Greek khitōn 'tunic'] 2a marine mollusk that has an oval flattened body with a shell of overlapping plates. [modern Latin (genus name)]Class Polyplacophora chiton in other Oxford dictionaries Definition of chiton in the British & World English dictionary