petrographic


pe·trog·ra·phy

P0225100 (pə-trŏg′rə-fē)n. The description and classification of rocks.
pe·trog′ra·pher n.pet′ro·graph′ic (pĕt′rə-grăf′ĭk), pet′ro·graph′i·cal (-ĭ-kəl) adj.pet′ro·graph′i·cal·ly adv.