Groundmass
[ground-mas] /ˈgraʊndˌmæs/
noun
1.
the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
/ˈɡraʊndˌmæs/
noun
1.
the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
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