Etymology
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petrology (n.)

"the study of rocks and their mineralogical composition," 1811 (erroneously as petralogy), from petro- (1) "rock" + -logy. Related: Petrological; petrologist.

updated on May 11, 2020

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Definitions of petrology from WordNet

petrology (n.)
the branch of geology that studies rocks: their origin and formation and mineral composition and classification;
Synonyms: lithology
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.