noun Petrology.
any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass.

1885–90; lampro- (< Greek lamprós clear) + -phyre

lamprophyric [lam-pruh-fir-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lamprophyre (ˈlæmprəˌfaɪə)
any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions
[C19: from Greek lampros bright + -phyre, from porphyry]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
lamprophyre   (lām'prə-fīr')  Pronunciation Key 
A dark igneous rock, having a porphyritic texture in which both the phenocrysts (larger crystals) and the matrix consist primarily of pyroxene, hornblende, and biotite.
The American Heritage® Science Dictionary
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