from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to the formation of rock
- adj. Produced by the incomplete combustion of petroleum
from The Century Dictionary and Cyclopedia
- In geology, relating to the origin of rocks in general or of special masses.
Ancient Greek πέτρος (petros, "rock") + -genic (Wiktionary)
petrol + -genic (Wiktionary)
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