phyllitePronunciation: /ˈfɪlʌɪt/Definition of phyllite noun [mass noun] Geology a fine-grained metamorphic rock with a well-developed laminar structure, intermediate between slate and schist. Origin: late 19th century: from Greek phullon 'leaf' + -ite1phyllite in other Oxford dictionaries Definition of phyllite in the US English dictionary
