cryolitePronunciation: /ˈkrʌɪəlʌɪt/Definition of cryolite noun [mass noun] a white or colourless mineral consisting of a fluoride of sodium and aluminium. It is added to bauxite as a flux in aluminium smelting. Origin: early 19th century: from cryo- 'cold, frost' (because the main deposits are found in Greenland) + -litecryolite in other Oxford dictionaries Definition of cryolite in the US English dictionary