n. the study of the origin, composition and structure of rock
the GNU version of the Collaborative International Dictionary of English
n. The department of science which is concerned with the mineralogical and chemical composition of rocks, and with their classification: lithology.
n. A treatise on petrology.
The Century Dictionary and Cyclopedia
n. The study of rocks from the point of view of their mineralogical composition; lithology; petrography. By some this term is used in a more limited sense. See the quotation, and also petrography.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the branch of geology that studies rocks: their origin and formation and mineral composition and classification
Word Usage
"This word petrology should be understood not from the more familiar oil of rocks but from what is in English an apparent pun by Jesus in the New Testament."