[pi-trog-ruh-fee] 
| the branch of petrology dealing with the description and classification of rocks, esp. by microscopic examination. |
| pe·trog·ra·phy (pə-trŏg'rə-fē) n. The description and classification of rocks. pe·trog'ra·pher n., pet'ro·graph'ic (pět'rə-grāf'ĭk), pet'ro·graph'i·cal (-ĭ-kəl) adj., pet'ro·graph'i·cal·ly adv. |
| petrography (pə-trŏg'rə-fē) Pronunciation Key
The description and classification of rocks, especially by means of microscopic analysis. |
rə