lamprophyrePronunciation: /ˈlamprəˌfʌɪə/Definition of lamprophyre noun [mass noun] Geology a porphyritic igneous rock consisting of a fine-grained feldspathic groundmass with phenocrysts chiefly of biotite. Origin: late 19th century: from Greek lampros 'bright, shining' + porphureos 'purple'lamprophyre in other Oxford dictionaries Definition of lamprophyre in the US English dictionary
