the branch of chemistry dealing with petroleum or its products.
the chemistry of rocks.

1935–40; petro-2 or petro-1 + chemistry Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
petrochemistry (ˌpɛtrəʊˈkɛmɪstrɪ)
1.  the chemistry of petroleum and its derivatives
2.  the branch of chemistry concerned with the chemical composition of rocks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The petrochemistry lab includes a clean lab for major and trace element geochemistry of crystalline rocks.
Petrochemistry of igneous rocks indicates a high-sodium low-alkaline series.
In some transformation industries, such as petrochemistry, activities that had high energy costs were abandoned.
Describes basic processes in industrial, process, and petrochemistry.
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