Definition of petro- combining form from the Oxford Advanced Learner's Dictionary



     combining form
    combining form
    BrE BrE//ˈpetrəʊ//
    ; NAmE NAmE//ˈpetroʊ//
    (in nouns, adjectives and adverbs)
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  1. 1connected with rocks petrology
  2. 2connected with petrol/gas petrochemical
  3. Word Originsense (1) from Greek petros ‘stone’, petra ‘rock’; sense (2) from petroleum.
See the Oxford Advanced American Dictionary entry: petro-