pelitePronunciation: /ˈpiːlʌɪt/Definition of pelite noun Geology a sediment or sedimentary rock composed of very fine clay or mud particles: the Eastern Cordillera comprises pelites of pre-Ordovician ageOrigin: late 19th century: from Greek pēlos 'clay, mud' + -ite1pelite in other Oxford dictionaries Definition of pelite in the US English dictionary