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Webster 1913 Edition
Porphyritic
Porˊphy-rit′ic
,Adj.
[Cf. F.
porphyritique
.] (Min.)
Relating to, or resembling, porphyry, that is, characterized by the presence of distinct crystals, as of feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline.