Collins Concise English Dictionary © HarperCollins Publishers::

petrography /pɛˈtrɒɡrəfɪ/ n
  1. the branch of petrology concerned with the description and classification of rocks
    Abbreviation: petrog

peˈtrographer n petrographic /ˌpɛtrəˈɡræfɪk/, ˌpetroˈgraphical adj

'petrography' also found in these entries:
In the English description:

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