porphyry

2 definitions found

porphyry - Collaborative International Dictionary of English v.0.48 :

  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.
     [1913 Webster]
  
     Porphyry shell (Zool.), a handsome marine gastropod shell
        (Oliva porphyria), having a dark red or brown polished
        surface, marked with light spots, like porphyry.
        [1913 Webster]

porphyry - WordNet (r) 2.1 (2005) :

  porphyry
      n 1: any igneous rock with crystals embedded in a finer
           groundmass of minerals [syn: porphyry, porphyritic rock
           ]