petrology Meaning, Definition & Usage

  1. noun the branch of geology that studies rocks: their origin and formation and mineral composition and classification
    lithology.

WordNet

Pe*trol"o*gy noun
Etymology
Petro + -logy.
Definitions
  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.

Webster 1913