groundmass
ground·mass
noun
1.
the matrix of fine-grained crystalline material in which larger crystals are embedded
Origin
From ground + mass.
Related words
Broader terms
Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.