petro-
combining form /petrəʊ/, /petrə/, /pəˈtrɒ/
/petrəʊ/, /petrə/, /pəˈtrɑː/
in nouns, adjectives and adverbs- connected with rocks
- petrology
- connected with petrol
- petrochemical
Word Originsense (1) from Greek petros ‘stone’, petra ‘rock’; sense (2) from petroleum.