Groundmass

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The matrix of fine-grained crystalline material in which larger crystals are embedded.
  2. 2
    (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded wordnet

Etymology

From ground + mass.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.