Definition of porphyritic
1 : of or relating to porphyry
2 : having distinct crystals (as of feldspar) in a relatively fine-grained base
Origin and Etymology of porphyritic
Middle English porphiritike, from Medieval Latin porphyriticus, from Greek porphyritikos, from porphyritēs (lithos) porphyry
First Known Use: 15th century
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