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petrography
petrol
petrol blue
petrol station
petroleum
petroleum jelly
petrolhead
petrolic
petrology
petronel
petrophysics
petrosal
petrous
petticoat
pettifogger
pettifogging
petting
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petrology
pe·trol·o·gy [ pə trólləjee ]


noun 
Definition:
 
study of rocks: the study of sedimentary, igneous, and metamorphic rocks with respect to their occurrence, structure, origin, history, and mineral content

pet·ro·log·i·cal [ pèttrə lójjik'l ] adjective
pet·ro·log·i·cal·ly adverb
pe·trol·o·gist [ pə trólləjist ] noun
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