noun Petrology.
a coarsely crystalline granite or other high-silica rock occurring in veins or dikes.

1825–35; < Greek pēgmat- (stem of pêgma) anything fastened together, a bond (compare pēgnýein to stick) + -ite1

pegmatitic [peg-muh-tit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pegmatite (ˈpɛɡməˌtaɪt)
any of a class of exceptionally coarse-grained intrusive igneous rocks consisting chiefly of quartz and feldspar: often occurring as dykes among igneous rocks of finer grain
[C19: from Greek pegma something joined together]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pegmatite   (pěg'mə-tīt')  Pronunciation Key 
Any of various coarse-grained igneous rocks that often occur as wide veins cutting across other types of rock. Pegmatites form from water-rich magmas or lavas that cool slowly, allowing the crystals to grow to large sizes. Although pegmatites can be compositionally similar to a number of rocks, they most often have the composition of granite.
The American Heritage® Science Dictionary
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