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1. Oxford American Dictionary

   porphyroblast

   • IPA[ˈpôrfərōˌblast]

   美式

   • n.
     a larger recrystallized grain occurring in a finer groundmass in a metamorphic rock.

   • noun: porphyroblast, plural noun: porphyroblasts

2. • 更多解釋

   porphyroblast

   • IPA[ˈpɔːfɪrə(ʊ)blɑːst]

   英式

   • n.
     a larger recrystallized grain occurring in a finer groundmass in a metamorphic rock.

   Oxford Dictionary