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petrology
petronel
petrophysics
petrosal
petrous
petticoat
pettifogger
pettifogging
petting
petting zoo
pettish
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petty cash
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petrography
pe·trog·ra·phy [ pi tróggrəfee ]


noun 
Definition:
 
rock examination to determine mineral content: the systematic description of the texture of rocks and the minerals they contain, often using microscopy of thin slices of the rock to determine the mineral content

pe·trog·ra·pher noun
pet·ro·graph·ic [ pèttrə gráffik ] adjective
pet·ro·graph·i·cal·ly adverb
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