catlinitePronunciation: /ˈkatlɪnʌɪt/Definition of catlinite noun [mass noun] a red clay of the Upper Missouri region, the sacred pipestone of the American Indians. Origin: mid 19th century: from the name of George Catlin (1796–1872), American artist, + -ite1catlinite in other Oxford dictionaries Definition of catlinite in the US English dictionary