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  1. groundmass

    • IPA[ˈɡraʊndmas]

    英式

    • n.
      the compact, finer-grained material in which the crystals are embedded in a porphyritic rock.
    • noun: groundmass

    • 更多解釋
    • IPA[ˈɡroundˌmas]

    美式

    • n.
      the compact, finer-grained material in which the crystals are embedded in a porphyritic rock.

    Oxford American Dictionary