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porphyry
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English Dictionary: porphyry by the DICT Development Group
2 results for porphyry
From WordNet (r) 3.0 (2006) [wn]:
porphyry
n
  1. any igneous rock with crystals embedded in a finer groundmass of minerals
    Synonym(s): porphyry, porphyritic rock
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Porphyry \Por"phy*ry\, n.; pl. {Porphyries}. [F. porphyre, L.
      porphyrites, fr. Gr. [?] like purple, fr. [?] purple. See
      {Purple}.] (Geol.)
      A term used somewhat loosely to designate a rock consisting
      of a fine-grained base (usually feldspathic) through which
      crystals, as of feldspar or quartz, are disseminated. There
      are red, purple, and green varieties, which are highly
      esteemed as marbles.
  
      {Porphyry shell} (Zo[94]l.), a handsome marine gastropod
            shell ({Oliva porphyria}), having a dark red or brown
            polished surface, marked with light spots, like porphyry.
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