Definition of porphyry noun from the Oxford Advanced Learner's Dictionary

 

porphyry

 noun
noun
BrE BrE//ˈpɔːfəri//
 
; NAmE NAmE//ˈpɔːrfəri//
 
[uncountable]
 
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a type of hard red stone that contains red and white crystals, which can be polished and made into statues, jewellery, etc. Word Origin late Middle English: via medieval Latin from Greek porphuritēs, from porphura ‘purple’.
See the Oxford Advanced American Dictionary entry: porphyry