Definition of petro- in English:

petro-

Pronunciation: /ˈpɛtrəʊ/

combining form

1Of rock; relating to rocks: petrography
2Relating to petroleum: petrodollar

Origin

sense 1 from Greek petros 'stone', petra 'rock'; sense 2 from petroleum.

Definition of petro- in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)