Groundmass

ahd-5
  • noun. The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. The matrix of fine-grained crystalline material in which larger crystals are embedded.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
    • Word Usage
    "The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass)."
    Hypernym
    Words that are more generic or abstract
    igneous rock  
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