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Noun: groundmass  'grawnd`mas
  1. (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded

Derived forms: groundmasses

Type of: igneous rock

Part of: porphyritic rock, porphyry

Encyclopedia: Groundmass

Nearest

ground-floor
groundhog
Groundhog Day
ground-hugging
grounding
groundkeeper
groundless
groundlessly
groundlessness
groundling
groundmass
groundnut
groundnut oil
groundnut vine
grounds
groundsel
groundsel bush
groundsel tree
ground-service crew
ground-shaker
groundsheet