Pe‐trol″o‐gy (?), n. [Petro + -logy.] 1. The department of science which is concerned with the mineralogical and chemical composition of rocks, and with their classification: lithology.
2. A treatise on petrology.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.