petrochemistry noun. [pɛtrǝ(ʊ)'kɛmɪstri] M20.
[from PETRO-¹, PETRO-² + CHEMISTRY.]
1. Geology. The branch of chemistry that deals with the composition and formation of rocks (as distinct from minerals, ore deposits, etc.), esp. igneous and metamorphic ones. M20.

2. The branch of chemistry that deals with petroleum and natural gas, and with their refining and processing. M20.

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