Petrology
[pi'trɒlәdʒi]
Definition
(noun.) the branch of geology that studies rocks: their origin and formation and mineral composition and classification.
Inputed by Agnes--From WordNet
Definition
(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.
Inputed by Celia