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Petra
Petrarchan sonnet
petrel
petri-
Petri dish
petrifaction
Petrified Forest National Park
petrify
Petrine
petro-
petrochemical
petrochemistry
petrodollar
petrogenesis
petroglyph
Petrograd
petrography
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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
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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