n.
Pronunciation: p ə - ' trä-l ə -j ē , pe-
Function: noun
Etymology: International Scientific Vocabulary
Date: 1811
: a science that deals with the origin, history, occurrence, structure, chemical composition, and classification of rocks
– pet · ro · log · ic \ ˌ pe-tr ə - ' lä-jik \ or pet · ro · log · i · cal \ -ji-k ə l \ adjective
– pet · ro · log · i · cal · ly \ -ji-k( ə -)l ē \ adverb
– pe · trol · o · gist \ p ə - ' trä-l ə -jist, pe- \ noun