Webster's English Dictionary

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porphyritic

por.phy.rit.ic \.po.r-f*-'rit-ik\ aj [ML porphyriticus, fr. Gk 
   porphyritikos, fr. porphyrite-s](lithos) porphyry 1: of or relating to 
   porphyry  2: having distinct crystals (as of feldspar) in a relatively 
   fine-grained  base