chitonPronunciation: /ˈkʌɪtɒn, -t(ə)n/Definition of chiton noun 1a long woollen tunic worn in ancient Greece. 2a marine mollusc that has an oval flattened body with a shell of overlapping plates. Class Polyplacophora Origin:from Greek khitōn 'tunic'. chiton (sense 2) is a modern Latin genus namechiton in other Oxford dictionaries Definition of chiton in the US English dictionary