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Ground mass

 - 2 dictionary results

ground⋅mass

  [ground-mas]
Use Ground mass in a Sentence
–noun
the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
Origin:
1875–80; ground 1 + mass
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ground·mass   (ground'mās')   
n.  The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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