Usually means: Fine-grained matrix in igneous rocks.
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We found 15 dictionaries that define the word groundmass:

General (14 matching dictionaries)
  1. groundmass: Merriam-Webster
  2. groundmass: Oxford Learner's Dictionaries
  3. groundmass: American Heritage Dictionary of the English Language
  4. groundmass: Collins English Dictionary
  5. groundmass: Vocabulary.com
  6. groundmass: Wiktionary
  7. groundmass: Webster's New World College Dictionary, 4th Ed.
  8. groundmass: Infoplease Dictionary
  9. groundmass: Dictionary.com
  10. Groundmass: Wikipedia, the Free Encyclopedia
  11. groundmass: Rhymezone
  12. groundmass: FreeDictionary.org
  13. groundmass: Mnemonic Dictionary
  14. groundmass: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. groundmass: Encyclopedia

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Definitions from Wiktionary (groundmass)

▸ noun:  (geology) The matrix of fine-grained crystalline material in which larger crystals are embedded.

Similar:
geological matrix, matrix, megacryst, massive, host rock, rock, macrocrystallinity, rockmass, nest, mush, more...

Opposite:
phenocryst, crystal, mineral, inclusion

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Similar:
geological matrix, matrix, megacryst, massive, host rock, rock, macrocrystallinity, rockmass, nest, mush, more...

Opposite:
phenocryst, crystal, mineral, inclusion



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